Let C(n) be the constant term in the expansion of (x + 3)n. Prove by induction t

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Oct 18th, 2017

(x+3)^1 is 3 = 3^1.

...is 3^(k-1) for some k

(x+3)^k = (x+3)^(k-1)*(x+3), so its constant term is 3^(k-1) * 3 = 3^k, as required.

May 23rd, 2015

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