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31 August, 10:10

What is the coefficient of the term x^7y in the expression of (x+y) ^8?

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  1. 31 August, 11:09
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    (r + 1) th term of (a + b) ^n = nCr a^ (n-r) b^r

    here n = 8, r = 8-7 = 1, a = a and b = y

    so we need second term where r = 1:-

    = 8 C 1 x^7y

    so the coefficient is 8
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