4. Solve the following Binomial problems: a) Find the expansion of (a + b)² b) What is the coefficient of b9 in (2 - b)¹⁹? c) What is the coefficient of a¹01699 in the expansion of (2a - 3b)200? 100 d) Give a formula for the coefficient of a* in the expansion of (a²-1) ¹0 where k € ZZ.

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