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Applications Of Permutations And Combinations Free Doubts and Solutions

CBSE - XI Science - Mathematics - Permutations and Combinations

How many words can be formed by taking 4 letters at a time out of the letters of the words MATHEMATICS? 

Asked by Kashifimam866 20th February 2019, 5:58 AM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Find the no. Of arrangements  of the letters of the  word Delhi if e always  comes before i.

Asked by Sh1989kishore 22nd October 2018, 10:12 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

How many 6 digit numbers can be formed with the digits 1,2,3,4,5,6,7 if the 10th and unit's places are always even and repetition is not allowed.

Asked by Rohit.koshta01 4th March 2018, 12:24 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

in how many ways can a party of 6 boys and 6 girls be seated at a circular table so that no two girls are adajacent ??  

Asked by tluser5 1st March 2018, 2:15 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

In how many ways can a vowel a consonant and a digit be chosen out of the 26 letters of the English alphabet and the 10 digits   

Asked by simran.gandhi27 17th February 2018, 2:20 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

help me in these types of proofs!!

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Asked by nitishkrnehu09 6th February 2018, 9:36 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Solve:

Asked by nitishkrnehu09 10th December 2017, 10:37 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

The question is attached

Asked by sudhanshubhushanroy 8th December 2017, 9:01 AM
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CBSE - XI Science - Mathematics - Permutations and Combinations

question is attched

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CBSE - XI Science - Mathematics - Permutations and Combinations

Question is attached.

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CBSE - XI Science - Mathematics - Permutations and Combinations

The question is attached

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CBSE - XI Science - Mathematics - Permutations and Combinations

Problem is attached.

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CBSE - XI Science - Mathematics - Permutations and Combinations

Problem is attached

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CBSE - XI Science - Mathematics - Permutations and Combinations

Problem is attached.

Asked by sudhanshubhushanroy 8th December 2017, 5:58 AM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Q. Ex. 8.3 - 25(ii) P.No. 441 : How mant different five letter words starting with  a vowel can be formed from the letters of the word EQUATION ?

ans. 4200

Q. Ex. 8.3 - 28(Iii) P.No. 441 : How many numbers greater than 20000 can be formed by using the digits 0,1,2,3,4 with no digit being repeated ?

ans. 72

 

 

Q. Ex. 8.3 - 29,  P.No. 441 : A moped licence plate has two letters and then four number in it . How many plates can be made without duplicating . There are no plates with number zero ? ans. 6759324

Q. Ex. 8.3 - 30, P.No. 441 : In an examination m there are three multiple choise questions and each question has four choices. Find the number of ways in which a student can fail to get all correct answers? ans. 43

Q. Ex. 8.3 - 31, P.No. 441 : There are three prizes to be distributed among six boys. In how many ways can it be done when (i) no boy gets more than one prize. (ii)there is no restriction as to the number of prizes any boy gets , (iii)no boy gets all the prizes ? ans. 120/216/210

Q. Ex. 8.3 - 32, P.No. 441 : There are 3 candidates and 5 voters. In how many ways can the votes be given ? If three candidates are among 5 voters and they vote for themselves only, then how many ways of giving votes are possible ? Why should everyone vote ? ans. 243/9 

Asked by sudhanshubhushanroy 8th September 2017, 12:00 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Q)In how many ways can the letters of the word "violent" be arranged so that vowels occupy only the odd places?

Asked by araima2001 29th November 2016, 9:51 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Q) Find the number of words that can be made by arranging the letters of the word "INTERMEDIATE" so that the order of vowels do not change?

Asked by araima2001 29th November 2016, 9:47 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Q)

Asked by araima2001 27th November 2016, 10:33 AM
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CBSE - XI Science - Mathematics - Permutations and Combinations

In an examination a question paper consists of 12 question divided into two parts i.e. Part 1 and Part II, containing 5 and 7 questions respectively. A student is required to attempt 8 question in all, selecting at least 3 form each part. In how many ways can a student select the questions 2.

Asked by Topperlearning User 13th September 2016, 3:09 AM
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CBSE - XI Science - Mathematics - Permutations and Combinations

In how many ways can 5 girls and 3 boys be seated in a row so that no two boys are together?

Asked by Topperlearning User 13th September 2016, 2:58 AM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Find the number of different 8 letter words formed from the letters of the word'TRIANGLE' IF each word is to
1.have no two vawels together
2.have both consonants and vowels together
3.have the relative position of the vowels and the consonants unaltered.

Asked by krishnapriya20 7th December 2015, 10:37 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

How to predict that a question belongs to permutation or combination?                                                            

Asked by AAKAASH PRAVINBABU 1st November 2015, 4:26 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

We wish to select 6 persons from 8, but if the person A is chosen, then B must be chosen. In how many ways can the selection be made?

Asked by shaktidevgun 26th September 2015, 8:05 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Show that the total number of ways in which six '+' and four '-' signs can be arranged in a line such that no two '-' signs occur together is 35.

Asked by shaktidevgun 26th September 2015, 6:37 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

how do i know when to use permutation or combination

Asked by Saksham 14th September 2015, 10:26 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

What is the number of non-negative integer solutions of the equation px+qy+rzgreater or equal thanm, if p, q, r are constants and the maximum possible value of x is a, max. possible value of y is b, and max. possible value of z is c?

Asked by Aditya Great 19th March 2015, 9:05 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

In how many ways can 5 person sit in acar,2 including the driver in the front seat and 3 in the back seat,if 2 particular persons do not know driving

Asked by Kunmunsahoo.2012 26th February 2015, 11:10 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Asked by Ibrahim Mohammed 1st October 2014, 7:41 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

If the letters of the word permutations are rearranged in a dictionary ,find its rank.

Asked by Ibrahim Mohammed 1st October 2014, 7:39 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

to find 'n; :-
(n-6)! / (n-4)! =6

Asked by Gishin Rajan 3rd September 2014, 11:05 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

How many 4 letters words can be formed by usign the words" I I T J E E" with no repetation?
 

Asked by Mihir Siwach 23rd August 2014, 4:28 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

WHY 0 FACTORIAL IS EQUAL TO 1

Asked by ksinghal.10 5th July 2014, 2:09 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Shankar has 6 friends. In how many ways can he invite one or more of them to a party at his home? Do you think true friendship is important in life? How?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

How many different numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that the digits cannot be repeated? How many of these will be even?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

Eighteen guests have to be seated, half on each side of a long table. Four particular guests desire to sit on one particular side and three others on the other on side. Determine the number of ways in which the sitting arrangement can be made.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

A committee of 7 has to be formed from 9 boys and 4 girls. In how many ways can this be done when the committee consists of (i) Exactly 3 girls (ii) At least 3 girls (iii) At most 3 girls

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

If 8 parallel lines in a plane are intersected by a family of 10 parallel lines. Find the number of parallelograms formed?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

A student has to answer 10 questions, choosing at least 4 from each of part A and part B. If there are 6 questions in Part A and in part B, in how many ways can the student choose 10 questions?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

How many triangles can be obtained by joining 12 points, five of which are collinear?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

In how many ways can 9 persons sit around a table so that all shall not have the same neighbours in any two arrangements?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Mathematics - Permutations and Combinations

From a group of 15 cricket players, a team of 11 players is to be chosen. In how many ways can this be done?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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