Question: Need help with these questions. Dont understand For each generating function below, find a formula for the coefficient of an. (a) (1 + 2.)3 (b)
Need help with these questions. Dont understand

For each generating function below, find a formula for the coefficient of an. (a) (1 + 2.)3 (b) 3x2 1 -x (c) 2x0 + 32-2 1 - x (1-x) 2 (d) 203 + 1 2-2x (e) 2x (3+6x)2 + 7
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