I need help on how to solve these homework problems.(adsbygoogle = window.adsbygoogle || []).push({});

1. Coefficient of x^12 in (1+x^2)(1-x)^-10

2.Find a generating function for the problem: there are 4 food categories, each category comprising of 20 distinct foods. Ten foods with at least one from each category is to be selected. how many menus are possible?

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# Combinatoric Problems, need help

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