Question

A box contains cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is a composite number.

Answer 1

Total number of cards in the box = 20.

Composite numbers from among given numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20.

Number of these composite numbers = 11.

∴ P(getting a composite number) = `11/20`.