Select Page

The number of positive integers which divide $240$ is-
(A) 18; (B) 20; (C) 30; (D) 24;

Discussion:

We use the formula for computing number of divisors of a number:

Step 1: Prime factorise the given number

$240 = 2^4 \times 3^1 \times 5^1$

Step 2: Use the formula for number of divisors: $(4+1) \times (1+1) \times (1+1) = 20$