Tuesday, 27 May 2014

algebra precalculus - Find the coefficient of x15y4 in the expansion of (2x3y)19

Not even sure I understand this question or know where to start, I understand the basics of finding coefficients but don't get how it's calculated "in the expansion of" another number. Looking for some sort of explanation as to how to solve this. I understand solving binomial coefficients but I'm not entirely sure how they related in this type of question.

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real analysis - How to find limhrightarrow0fracsin(ha)h

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