Generating functions
Find the coefficient on x10in each of the generating functions below.
a) (x3+x5+x6)(x4+x5+x7)(1+x5+x10+x15+...)
b) (1+x3)(x3+x4+x5+...)(x4+x5+x6+x7+x8+...)
c) (1+x)12
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