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 even or a multiple of 12.

Answer 1

Count the even numbers from 1 to 25. (2,4,6,8,10,12,14,16,18,20,22,24) 12 of them

Count the numbers that are a multiple of 12 (12, 24) 2 of them

Count the numbers in both groups: (12, 24). 2 of them.

So then,

P = (12+2 -2 ) / 25 = 0.48 (answer)