Question

Let $X=\{1,2,3,4,5,6,7,8,9\}$. then total number of subsets of $X$ having atleast one and atmost eight elements is

• A. 510
• B. 511
• C. 255
• D. 254

Answer 1

Answer: (A)

Subsets $=2^9-1-1=510$