differentiation

Question: If $y = 1 + x + \frac{{{x^2}}}{{2\,!}} + \frac{{{x^3}}}{{3\,!}} + ..... + \frac{{{x^n}}}{{n\,!}}$, then $\frac{{dy}}{{dx}} = $

1) y

2) $y + \frac{{{x^n}}}{{n!}}$

3) $y - \frac{{{x^n}}}{{n!}}$

4) $y - 1 - \frac{{{x^n}}}{{n!}}$

Solution:

Explanation: Explanation

standard-differentiation

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