Question

Let \( n(A) = m \) and \( n(B) = n \), if the number of subsets of \( A \) is 56 more than that of subsets of \( B \), then \( m + n \) is equal to:

• A. 9
• B. 13
• C. 8
• D. 10

Hint:

The number of subsets of a set with \( n \) elements is given by \( 2^n \). Factorization techniques are helpful when solving exponential equations.