if a number is chosen at random from the integer 5-25 inclusive find the probability that the number is a multiple of 5 or 3

Answer 1

there are 21 numbers available.
Multiples of 3 or 5: 5,6,9,10,12,15,18,20,21,24,25 -- 11 in all
so, the probability is 11/21

Answer 2

It was great and understandable