Mathematics · 2020
JEE Main · 7 January 2020, Shift 2 · Q55
The coefficient of x^7 in the expression (1+x)^10+x(1+x)^9+x^2(1+x)^8+…+x^10 is:
The coefficient of $\displaystyle x^7$ in the expression $\displaystyle (1+x)^{10}+x(1+x)^9+x^2(1+x)^8+\ldots+x^{10}$ is :
Official answer
(2)
$\displaystyle 330$
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JEE Main 2020 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.