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It's actually permutation not composition, so P(n,2) = n * (n-1), C(n,2) = n * (n-1) / 2
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Sherlock and Pairs
You are viewing a single comment's thread. Return to all comments →
It's actually permutation not composition, so P(n,2) = n * (n-1), C(n,2) = n * (n-1) / 2