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\frac{1}{1.2} + \frac{1}{2.3} + \frac{1 .}{3.4} + . . . a n d 1 - \frac{1}{2} + \frac{1}{3} - \frac{1}{4} + . . .

1, In 2

In 2, 1

e^{- 1}, I n 2

e, e^{- 1}

None

ANS : 1

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