Question

If A = {1,2,3,4,5}, then the number of proper subsets of A is

• A. 120
• B. 30
• C. 31
• D. 32

Answer 1

The correct option is C

31

The number of proper subsets of any set is given by the formula $2^n-1$, where n is the number of elements in the set.

Here,

n = 5

$\therefore$ Number of proper subsets of A

$2^5-1=31$