THE NUMBER OF SUBSETS OF THE SET A = (a_1,a₂,a_3,.........a_n) WHICH CONTAIN EVEN NUMBER OF ELEMENTS ARE:

1. 2^n-1
2. 2ⁿ-1

Hello student,
The total number of subsets for a n element set is given bt 2ⁿ
Hence number of subsets which contain even number of
elements is given by 2ⁿ/2=2^n-1