Class 11 Maths Binomial Theorem General term

General term in the expansion of (a+b)n  is Tr+1 = nCr  an–r br

Numerical: Find the 4th  term in the expansion of (x – 2y)12

Solution:  Putting r=3,n=12, a =x & b= -2y in this formula the formula, Tr+1 = nCr  an–r br

T4 = 12C3 (x)9(-2y)3

Or T4 = -1760 x9 y3

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