If you draw one card at random from a deck of 18 cards numbered 1 through 18, inclusive, what is the probability that the number you draw is divisible by 6?

Answer 1

There are 3 such multiples,
6,12, and 18

prob(of your event) = 3/18 = 1/6

Answer 2

If you draw one card at random from a deck of 17 cards numbered 1 through 17, what is the probability that the number you draw is divisible by 5 and odd?