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

ANSWERS

2015-11-09 21:34:45

(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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