1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?
A
36
B
120
C
240
D
720
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If the total number of m-element subsets of the set A = {a1, a2, ..., an} is k times the number of m element subsets containing a4, then n is
A
(m $$ - $$ 1)k
B
mk
C
(m + 1)k
D
(m + 2)k
3
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
4
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! $${}^7{C_3}$$$${}^4{C_3}$$
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Medical
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Graduate Aptitude Test in Engineering
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CBSE
Class 12