The coefficient of x 18 in the product (1+x)(1–x) 10 (1+x+x 2 ) 9 is :

Question:
The coefficient of $x^{18}$ in the product $(1+x)(1-x)^{10}$ $\left(1+x+x^{2}\right)^{9}$ is :

Correct Option: 1

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

JEE Main Previous Year April 12, 2019 (I)

Solution: