If $y = 1 + x + {{{x^2}} \over {2\,!}} + {{{x^3}} \over {3\,!}} + ..... + {{{x^n}} \over {n\,!}}$, then ${{dy} \over {dx}} = $
- Ay
- B$y + {{{x^n}} \over {n!}}$
- C$y - {{{x^n}} \over {n!}}$
- D$y - 1 - {{{x^n}} \over {n!}}$
Similar Questions
Find unit vector perpendicular to $\vec A$ and $\vec B$ where $\vec A = \hat i - 2\hat j + \hat k$ and $\vec B = \hat i + 2\hat j$
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- [JEE MAIN 2020]