MEDIUM
WBJEE
IMPORTANT
Earn 100
The number of selection of objects from objects of which are identical and the rest are different, is
16.67% studentsanswered this correctly
Important Questions on Permutation and Combination
EASY
WBJEE
IMPORTANT
From a collection of consecutive natural numbers, four are selected such that they are not consecutive. The number of such selections is
EASY
WBJEE
IMPORTANT
On the occasion of Dipawali festival each student of a class sends greeting cards to others. If there are students in the class, then the total number of greeting cards exchanged by the students is
EASY
WBJEE
IMPORTANT
There are greeting cards, each of a different colour and envelopes of same colours as that of the cards. The number of ways in which the cards can be put in envelopes, so that exactly of the cards go into envelopes of respective colour is,
