The coefficient of x 7 in the expansion of (1– x – x 2 + x 3 )6 is

Question:

The coefficient of $x^{7}$ in the expansion of $\left(1-x-x^{2}+x^{3}\right)^{6}$ is

  1. $-132$

  2. $-144$

  3. 132

  4. 144

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 2011

Solution:

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