Questions
The number of subsets of the set which contain even number of elements is
detailed solution
Correct option is A
For each of the first (n – 1) elements a1, a2 ….…,an−1 we have two choices: either ai(1≤i≤n−1) lies in the subset or ai doesn’t lie in the subset. For the last element we have just one choice. If even number of elements have already been selected, we do not include an in the subset otherwise (when odd number of elements have been selected) we include it in the subset Thus, the number of subsets of A=a1,a2,…,an which contain even number of elements is equal to 2n−1Similar Questions
is equal to
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