Grade 10IIT JEE Entrance Exam
find the coefficient of x^n in the expansion of (1+x)(1-x)^n
find the coefficient of x^n in the expansion of (1+x)(1-x)^n
1 Answer
Ravi
Expand the (1-x)nto get the coeff. of xnandxn-1. These terms when multiplied with the bracket term (1+x) will give all the terms having xn. The sum of coefficients of both these terms will be the coeff. of xnin this expansion.
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