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(1 point) What is the coefficient of x8y9 in the expansion of (3x+2y)17 ? (4 points) Show that if n is a positive integer, then

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(1 point) What is the coefficient of x8y9 in the expansion of (3x+2y)17 ? (4 points) Show that if n is a positive integer, then (2n2)=2(n2)+n2 (a) using combinatorial argument. (b) by algebraic manipulation

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