How many different ways can you choose 3 vowels out of the box, if there are 5 vowels in the box and the order does not matter?
a. 10
b. 15
c. 30
d. 60

The correct answer is a. 10

That's because you need to do it as 5 x 4 x 3 because there's 5 options for the first one, 4 for the second, and 3 for the third. However, you divide it by 6 because of the number of options since it doesn't matter, so you get 5 x 4 x 3 and thn divided by 6 to give 10.