The football team has 16 seniors. If four captains can be chosen, how many different sets of captains can be selected?

Question

I want to know how to setup the equation. Im Very bad when it comes to probabilities 

Answer 1

This question is equivalent to  "How many ways can you pick 4 things from 16.

The answer is ₁₆C₄ = 16!/(12! * 4!).

I will leave the arithmetic to you.