The probability that a number selected at random from the first 50 natural numbers is a composite number is__________?

A. 21/25
B. 17/25
C. 4/25
D. 8/25

Explanation:

The number of exhaustive events = ⁵⁰C₁ = 50.

We have 15 primes from 1 to 50.
Number of favourable cases are 34.
Required probability = 34/50 = 17/25.