Question

What is the probability that a number selected at random from the set {2, 3, 7, 12, 15, 22, 72, 108} will be divisible by both 2 and 3 ? *

Answer 1

Find how many numbers are divisible by two and three, then place that number above the total number of items in the set as a fraction. Like this:
$\frac{Total-numbers -divisible-by-2-and-3}{Total-numbers-in-set}$