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CBSE Class 11-science Answered

I have problems in such types of problems... Please teach me how to approach such questions...
 
Asked by nitishkrnehu09 | 09 Dec, 2017, 01:38: PM
answered-by-expert Expert Answer
begin mathsize 16px style straight f left parenthesis straight x right parenthesis equals straight f left parenthesis straight y right parenthesis straight x not equal to straight y then space it space is space many space one space function also space it space is space given space that space there space are space only space two space preimages space in space straight A space for space straight a space given space element space of space straight B now space we space can space make space 3 space groups space of space space 2 space elements space from space elements space of space straight A no. space ways space to space make space 3 space groups space of space 2 space element space each equals 6 cross times 5 equals 30 space ways now space selecting space one space group space from space 3 space equals 3 space ways this space one space group space has space space 5 space options space left parenthesis elements space of space straight B right parenthesis second space group space has space 4 space options space third space has space 3 space options so space total equals 30 cross times 3 cross times 5 cross times 4 cross times 3 equals 5400 space end style
Answered by Arun | 17 Dec, 2017, 04:39: PM

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CBSE 11-science - Maths
A and B are two sets such that n (A) = 4 and n(B) = 8. Find the minimum value of n(A  B).
Asked by Topperlearning User | 17 Apr, 2014, 11:58: AM
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CBSE 11-science - Maths
A survey was conducted on 110 people of Delhi. It was found that 65 people watched Hindi movie and 51 watched English movie and where as 24 watched both the movies. Find the number of people who did not watch any movie on that day.
Asked by Topperlearning User | 17 Apr, 2014, 11:45: AM
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CBSE 11-science - Maths
Let A and B be two finite disjoint sets such that n (A  B) = 400, n(A) = 250. Find n(B).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
Let A and B be two finite sets such that n(A – B) = 30, n (A  B) = 180, n(A  B) = 60, find n(B).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
Out of 600 mobile owners investigated, 500 owned Nokia hand set and 180 owned Tata hand set; 30 owned both Nokia and Tata hand sets. Is this data correct?
Asked by Topperlearning User | 17 Apr, 2014, 01:18: PM
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CBSE 11-science - Maths
In a group of 85 people, 50 like Hindi movies, 10 like both Hindi and English movies. How many like English movies and not Hindi. How many like English movies?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
In a group, students know at least one of the languages, German or French. 100 students know German and 40 know French and 10 know both German and French. If there are 20 students who know neither of the two languages, how many students are there in the group?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
A class got 48 distinctions in maths, 25 in physics and 30 in chemistry. If these went to a total of 68 students and only 5 students got distinctions in all the three subjects, how many students got distinctions in exactly two of the three subjects?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
If A and B are two sets such that  A union B  has 40 elements, A has 30 elements and B has 20 elements, how many elements does the shaded region have?
Asked by Topperlearning User | 31 Aug, 2016, 11:28: PM
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CBSE 11-science - Maths
In a class of 60 students 30 students play harmonium and 40 students play guitar. How many students play both the instruments?
Asked by Topperlearning User | 17 Apr, 2014, 11:47: AM
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