# 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?

**Kashifimam866**20th February 2019, 5:58 AM

### 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.

**Sh1989kishore**22nd October 2018, 10:12 PM

### 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.

**Rohit.koshta01**4th March 2018, 12:24 PM

### 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 ??

**tluser5**1st March 2018, 2:15 PM

### 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

**simran.gandhi27**17th February 2018, 2:20 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## help me in these types of proofs!!

**nitishkrnehu09**6th February 2018, 9:36 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## Solve:

**nitishkrnehu09**10th December 2017, 10:37 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## The question is attached

**sudhanshubhushanroy**8th December 2017, 9:01 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## question is attched

**sudhanshubhushanroy**8th December 2017, 6:48 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## Question is attached.

**sudhanshubhushanroy**8th December 2017, 6:43 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## The question is attached

**sudhanshubhushanroy**8th December 2017, 6:30 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## Problem is attached.

**sudhanshubhushanroy**8th December 2017, 6:00 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## Problem is attached

**sudhanshubhushanroy**8th December 2017, 5:59 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## Problem is attached.

**sudhanshubhushanroy**8th December 2017, 5:58 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

##
**Q. Ex. 8.2 24 P.No. 427** : Given 6 flags of different colours. How many different signals can be geberated by hoisting the flags on a vertcal pole one below the other each signal requires the use of atleast 4 flags. ans. 1800

**Q. 8.3 6(ii) P.No. 439** : Seven candidates are contesting an election . In how many ways can their names be listed on the ballot paper ? ans. 5040

**Q. 8.3 (9) P.No. 440** : In how many ways three different rings can be worn in four fingers with atmost one in each finger ? ans. 24

**Q. Ex. 8.3 (16) P.No. 440** : How many numbers consisting of five different digits can be made from the digits 14,2,3,9 if (i) the number must be odd , (ii) the first two digits of each number are even ? ans. 8400/2520

**Q. Ex. 8.3 - 24(ii) P.No. 441** : Find the number of ways in which 5 boys and 5 girls may be seated in a row so that no two boys are together. ans. 86400

**Q. Ex. 8.2 24 P.No. 427** : Given 6 flags of different colours. How many different signals can be geberated by hoisting the flags on a vertcal pole one below the other each signal requires the use of atleast 4 flags. ans. 1800

**Q. 8.3 6(ii) P.No. 439** : Seven candidates are contesting an election . In how many ways can their names be listed on the ballot paper ? ans. 5040

**Q. 8.3 (9) P.No. 440** : In how many ways three different rings can be worn in four fingers with atmost one in each finger ? ans. 24

**Q. Ex. 8.3 (16) P.No. 440** : How many numbers consisting of five different digits can be made from the digits 14,2,3,9 if (i) the number must be odd , (ii) the first two digits of each number are even ? ans. 8400/2520

**Q. Ex. 8.3 - 24(ii) P.No. 441** : Find the number of ways in which 5 boys and 5 girls may be seated in a row so that no two boys are together. ans. 86400

**sudhanshubhushanroy**8th September 2017, 11:57 AM

### 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?

**araima2001**29th November 2016, 9:51 PM

### 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?

**araima2001**29th November 2016, 9:47 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## Q)

**araima2001**27th November 2016, 10:33 AM

### 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.

**Topperlearning User**13th September 2016, 3:09 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## From a class of 25 students, 10 are to be chosen for an excursion party there are 3 students who decide that either all of them will join or none of them will join. In how many ways can they be chosen? Now a day's teenager's behavior is highly influenced under peer pressure without considering its pros and cons. Do you think that teachers' suggestion plays an important role in development of students' life?

**Topperlearning User**13th September 2016, 3:04 AM

### 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?

**Topperlearning User**13th September 2016, 2:58 AM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## How many words with or without meaning each with 2 vowels and 3 consonants can be formed from the letters of the word FRACTION?
Find the number of arrangements of the letters of the word INTERMEDIATE
In how many of these arrangements
i) do the words start and end with the letter I
ii) do all the E's always occur together

**ahuja8087**8th June 2016, 12:35 AM

### 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.

**krishnapriya20**7th December 2015, 10:37 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

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

**AAKAASH PRAVINBABU**1st November 2015, 4:26 PM

### 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?

**shaktidevgun**26th September 2015, 8:05 PM

### 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.

**shaktidevgun**26th September 2015, 6:37 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## how do i know when to use permutation or combination

**Saksham**14th September 2015, 10:26 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## What is the number of non-negative integer solutions of the equation px+qy+rzm, 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?

**Aditya Great**19th March 2015, 9:05 PM

### 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

**Kunmunsahoo.2012**26th February 2015, 11:10 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

**Ibrahim Mohammed**1st October 2014, 7:41 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

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

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

**Ibrahim Mohammed**1st October 2014, 7:39 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

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

**Gishin Rajan**3rd September 2014, 11:05 PM

### 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?

**Mihir Siwach**23rd August 2014, 4:28 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

## WHY 0 FACTORIAL IS EQUAL TO 1

**ksinghal.10**5th July 2014, 2:09 PM

### 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?

**Topperlearning User**4th June 2014, 1:23 PM

### 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?

**Topperlearning User**4th June 2014, 1:23 PM

### 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.

**Topperlearning User**4th June 2014, 1:23 PM

### 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

**Topperlearning User**4th June 2014, 1:23 PM

### 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?

**Topperlearning User**4th June 2014, 1:23 PM

### 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?

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - XI Science - Mathematics - Permutations and Combinations

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

**Topperlearning User**4th June 2014, 1:23 PM

### 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?

**Topperlearning User**4th June 2014, 1:23 PM

### 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?

**Topperlearning User**4th June 2014, 1:23 PM