QuestionIdentify the incorrect expression for the sum $$-x \sum_{r=0}^{3} \frac{x^{r+1}}{r !}$$ from the options given.

Studdy Solution
For option c, let's simplify it$$\frac{-6 x^{2}-6 x^{3}-3 x^{4}-x^{5}}{6} = -x^{2} - x^{3} - \frac{x^{4}}{2} - \frac{x^{5}}{6}$$This is not the same as our expression, so option c is also incorrect.
However, the question asks for the expression that is NOT correct, so the answer is option b.