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If y=1+x+(x^2)/(2!)+(x^3)/(3!)+...+(x^n)...

If `y=1+x+(x^2)/(2!)+(x^3)/(3!)+...+(x^n)/(n !),t h e n(dy)/(dx)` is equal to (a) `y` (b) `y+(x^n)/(n !)` (c) `y-(x^n)/(n !)` (d) `y-1-(x^n)/(n !)`

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