WBJEE2020MathematicsPermutation and CombinationActual
If the total number of m-element subsets of the set A = a 1 , a 2 , . a n is k times the number of m element subsets containing a 4 , then n is
Correct answer
1
Step-by-step solution
Hint: n_ c_ m =k^ n-1 c_ m-1 n=m k