Question
a shopkeeper sells 4 kinds of albums.find the number of different sets of 7 albums that one can buy
Answers
a few seconds with google turned up
https://math.stackexchange.com/questions/686/combinations-of-selecting-n-objects-with-k-different-types
https://math.stackexchange.com/questions/686/combinations-of-selecting-n-objects-with-k-different-types
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