1 . 1-x-2

• A. ${\left(-1\right)}^{r}r{x}^r$
• B. $\left(r+1\right)x^{r+1}$
• C. $\left(r+1\right)x^r$
• D. ${\left(-1\right)}^r\left(r+1\right)x^r$

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Answer: Option D

Explanation: