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There are k kinds of postcards, each with a limited amount. Let there be ai copies of the i-th
postcard. How many ways are there to send these postcards to n friends? (Each friend can
receive zero cards, as well as multiple copies of the same card.)
Solution
no.of ways=(ak+ n-1)C(n-1) )

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  • 1. There are k kinds of postcards, each with a limited amount. Let there be ai copies of the i-th postcard. How many ways are there to send these postcards to n friends? (Each friend can receive zero cards, as well as multiple copies of the same card.) Solution no.of ways=(ak+ n-1)C(n-1) )