Question

In a lottery​ game, a single ball is drawn at random from a container that contains 25 identical balls numbered from 1 through 25. find the probability that the number drawn is a multiple of 77 or a multiple of 4.

Answer 1

Total numbers = 1-25 = 25 numbers

Multiples of 77: 1, 7, 11
Multiples of 4: 1, 2, 4

Therefore, multiples of 77 or 4 are: 1, 2, 4, 7, 11 = 5 numbers

P (multiples of 7 or 4) = 5/25 = 1/5 = 0.2