The coefficient of x n in expansion of (1 )(1 )n + – x x is

Question:

The coefficient of $x^{n}$ in expansion of $(1+x)(1-x)^{n}$ is

  1. $(-1)^{n-1} n$

  2. $(-1)^{n}(1-n)$

  3. $(-1)^{n-1}(n-1)^{2}$

  4. $(n-1)$

Correct Option: 2

JEE Main Previous Year 1 Question of JEE Main from Mathematics Binomial Theorem and its Simple Applications chapter.
JEE Main Previous Year 2004

Solution:

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