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The sum of 20 terms of the series whose ...

The sum of 20 terms of the series whose rth term s given by k`T(n)=(-1)^n(n^2+n+1)/(n !)` is `(20)/(19 !)` b. `(21)/(20 !)-1` c. `(21)/(20 !)` d. none of these

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