Questions
There are 4n things of which n are alike and all the rest different. Then the number of permutations of 4n things taken 2n at a time, each permutation containing the n like things
detailed solution
Correct option is D
Cn 3n×(2n)!n!=3n!(n!)2 (Selection and Arrangement)Similar Questions
Let be a set containing elements. The number of reflexive relations that can be defined on is
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