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13-10-2017
Mathematics

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Find the 5th term of the expansion of (x + y)9.

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13-10-2017

(r + 1)th term of (x + y)^n = nCr x^(n-r)y^r

so here we have 9C4 x^(9-4)y^4

= 126x^5y^4 Answer

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