You have the numbers 1–24 written on slips of paper. if you choose one slip at random, what is the probability that you will not select a number which is divisible by 3

The numbers that are divisible by 3 are:

3, 6, 9, 12, 15, 18, 21, 24
that is 8 numbers divisible by 3

24-8=16 numbers NOT divisible by 3

so the probability of not picking a number divisible by 3 is 16/24

hope this helps and is right :)