Coefficient of $x^3$ in the expansion of $(x^2 - x + 1)^{10} (x^2 + 1 )^{15}$ is equal to
Coefficient of $x^3$ in the expansion of $(x^2 - x + 1)^{10} (x^2 + 1 )^{15}$ is equal to
- A
$-360$
- B
$-240$
- C
$-180$
- D
$60$
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- [JEE MAIN 2021]
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