Mark M. answered • 09/17/17
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x2 is in the n-2 term
135n = nCn-2
135n = n! / (n - (n - 1))(n - 2)!
Can you take it from here?
Rachel L.
asked • 09/17/17in the expansion of (3x+1)^n, the coefficient of the term in x^2 is 135n, where n E Z+. Find n.
I don't have any idea how to do this! i know how to do binomial theorem but not this. I live in the US and taking Ib sl 2 math as a junior.
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