Question

A set contains $k$ elements. The power set of this set contains_______ elements.

• A. $k$
• B. $2^k-2$
• C. $2^k$
• D. $k^2$

Answer 1

Answer: (C)

$2^k$

Answer 2

If a set contains $n$ elements, then its power set has $2^n$ elements.