(a) Find the coefficient of x7 in (l + x + x2 + x3 +......)15. (b) Find...

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(a) Find the coefficient of x7 in
(l + x + x2 + x3 +......)15.
(b) Find the coefficient of x1 in
(1 + x + x2 + + ...... )n for n ∈ Z+.
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