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23 February, 02:12

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

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  1. 23 February, 03:49
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    (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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