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 number divisible by 3.

Answer 1

Total number of cards in the box = 20.

Numbers divisible by 3 from among given numbers are 3, 6, 9, 12, 15, 18.

Number of these numbers divisible by 3 = 6.

∴ P(getting a number divisible by 3) = `6/20 = 3/10`.