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Use the binomial theorem to find:(a) the coefficient of r4 in the expansion of (x...

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Algebra

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Use the binomial theorem to find:(a) the coefficient of r4 in the expansion of (x + 3)?(b) the sum 1 + 3n +9(n 2) +......+3?(n k)+...+ 3?-(n n-2)+3?-n+ 3?

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