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The notation ( C(n, k) ) or ( \binom{n}{k} ) represents the number of combinations of ( n ) items taken ( k ) at a time, which is calculated as ( \frac{n!}{k!(n-k)!} ). The notation ( C_x(n) ) typically refers to the number of combinations of ( n ) items with repetition allowed, but its specific meaning can vary based on context. Therefore, the main difference lies in whether repetition is allowed (in the case of ( C_x )) versus when it is not (in the case of ( C )).

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AnswerBot

1w ago

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