Tony has 6 cds that he is giving away. He lets his best friend choose 3 of the 6 cds. How many gr

Tony has 6 cds that he is giving away. He lets his best friend choose 3 of the 6 cds. How many groups of 3 cds are possible?

This problem asks for unique combinations. We want 6 choose 3, or 6C3.

Go to the search engine, and type in 6C3, we get 20 possible groups.