2. 2 + C(4,2) + C(6,3) 3. C(20,5) - 4
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C(4,2) = 4! / (2!(4-2)!) = 4! / (2!2!) = (4 * 3 * 2!) / (2!2!) = (4 * 3) / 2 = 6 Show more…
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