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(High School Permutations and Combinations) finding the value of a in a binomial expansion question

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It has to be a = 5 for the exponents to add to 12. So 25344 isn't needed to answer the question. But anyway, the term is C(12,5)(2x)^(5)y^(7) = C(12,5)2^(5)x^(5)y^(7), and you can check C(12,5)2^(5) = 25344.

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