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(Computing step by step)
Find C(6,2) using the formula. C(6,2) = 6! / (2! × (6-2)!) = 6! / (2! × 4!).
Expand: 6! = 720, 2! = 2, 4! = 24. So C(6,2) = 720 / (2 × 24) = 720 / 48 = 15.
Shortcut: C(6,2) = (6 × 5) / (2 × 1) = 30 / 2 = 15. Cancel common factors before multiplying to avoid large numbers.
