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Mathematics 20 Online
OpenStudy (anonymous):

Find the coefficient of x5 in the expansion of (x - 1)9

OpenStudy (raden):

9C4*(x)^(9-4)*(-1)^4 = 9C4x^5 just calculating of 9C4 hint : use the combination formula : nCr = n!/((n-r)!r!) good luck.....

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