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Show that C(n, r)C(r, 2) = C(n, 2)C(n - 2, r - 2) whenever n and r are integers with 2 < r < n.?

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  • Show that C(n, r)C(r, 2) = C(n, 2)C(n - 2, r - 2) whenever n and r are integers with 2 < r < n.?


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