WBJEE SERIES Mathematics
Combinations
4 previous year questions.
Volume: 4 Ques
Yield: Medium
High-Yield Trend
2
2022 1
2019 1
2012 Chapter Questions 4 MCQs
01
PYQ 2012
medium
mathematics ID: wbjee-20
The number of diagonals in a regular polygon of sides is
1
4950
2
4850
3
4750
4
4650
02
PYQ 2019
medium
mathematics ID: wbjee-20
A candidate is required to answer 6 out of 12 questions which are divided into two parts A and B, each containing 6 questions and he/she is not permitted to attempt more than 4 questions from any part. In how many different ways can he/she make up his/her choice of 6 questions ?
1
850
2
800
3
750
4
700
03
PYQ 2022
medium
mathematics ID: wbjee-20
There are white and black balls marked . The number of ways in which we can arrange these balls in a row so that neighboring balls are of different colors is
1
(n!)2
2
(2n)!
3
2(n!)2
4
(2n)! /(n!)2
04
PYQ 2022
medium
mathematics ID: wbjee-20
is a set containing elements. and are two subsets of . Then the number of ways of choosing and such that is
1
2 2n-2n Cn
2
2n
3
3n-1
4
3n