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combinations

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a. consider the multiset {n times a, 1,2,3,...n} of size 2n. Determine the number of its n- combinations.

b. consider the multiset {n times a, n times b, 1,2,3...,n+1} of size 3n+1. Determine the number of its n- combinations.

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Solution Summary

Determine the number of its n- combinations.

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