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3 May, 14:19

What is the coefficient of the term x7y in the expansion of (x + y) 8?

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  1. 3 May, 18:03
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    We have to find the coefficient of the term x^7 y in the expansion of: (x + y) ^8a = x, b = y, n = 8And the expansion is: n n

    ∑ () a ^ (n-k) b ^k

    k=0 ka^ (n-k) b^k = x^7 ySo : k = 1nCk = 8C1 = 8Answer: The coefficient of the term x^7y is 8.
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