And we don't care about the order. That's why we're dealing with combinations, not permutations. We don't care about the order. How many different groups of four can we pick out of 60? We don't care what order we pick them in. We've seen in previous videos that there is a formula here, but it's important to understand the reasoning behind the formula. I'll write the formula here, but then we'll think about what it's actually saying.