Suppose you are asked to choose three movies. If there are 20 different movies, in how many ways can

[math_celebrity]

Suppose you are asked to choose three movies. If there are 20 different movies, in how many ways can the three movies be chosen?

We want unique combinations, so we have 20 choose 3:

We type 20C3 into our search engine and we get:
20C3 = 1,140