Question

A box contains 90 discs, numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears prime number less than 23 is

Answer 1

Correct Answer - C
Total number of discs = 90.
Prime number less than 23 are 2,3,5,7,11,13,17,19.
Their number is 8.
P(getting a prime number less than 23) = `8/90 = 4/45`.