1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
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?
A
850
B
800
C
750
D
700
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
There are 7 greeting cards, each of a different colour and 7 envelopes of same 7 colours as that of the cards. The number of ways in which the cards can be put in envelopes, so that exactly 4 of the cards go into envelopes of respective colour is,
A
$${}^7{C_3}$$
B
2 . $${}^7{C_3}$$
C
3! $${}^4{C_4}$$
D
3! $${}^7{C_3}$$$${}^4{C_3}$$
3
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The number of selection of n objects from 2n objects of which n are identical and the rest are different, is
A
2n
B
2n $$-$$ 1
C
2n $$-$$ 1
D
2n $$-$$ 1 + 1
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If (2 $$ \le $$ r $$ \le $$ n), then $${}^n{C_r}$$ + 2 . $${}^n{C_{r + 1}}$$ + $${}^n{C_{r + 2}}$$ is equal to
A
2 . $${}^n{C_{r + 2}}$$
B
$${}^{n + 1}{C_{r + 1}}$$
C
$${}^{n + 2}{C_{r + 2}}$$
D
$${}^{n + 1}{C_r}$$
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