The number of subsets of $\{ 1,2,3 , \ldots , 10 \}$ having an odd number of elements is
(A) 1024
(B) 512
(C) 256
(D) 50 .
The number of subsets of $\{ 1,2,3 , \ldots , 10 \}$ having an odd number of elements is\\
(A) 1024\\
(B) 512\\
(C) 256\\
(D) 50 .