..1. In the game of Bingo, the numbers 1 to 75 are marked on balls and drawn from a container that constantly mixes the balls. Fifteen balls, numbered 1 to 15, are marked with a B; the next fifteen with an I; and so on.

a) What is the probability that an O is drawn first? Ans: 1/5

Mr F says: 5/75 .....

b) What is the probability that a multiple of 5 is drawn first? 1/5

Mr F says: How many multiples of 5 are there in the first 75 numbers? Now divide that number by 75 .....