Only evens allowed

Calculus Level 3

Let Sn=11+12+12×4++12×4××2n S_n = \frac{1}{1} + \frac {1}{2} + \frac {1}{2 \times 4} + \ldots + \frac { 1 } { 2 \times 4 \times \cdots \times 2n } . Evaluate

limnSn. \lim_{n\rightarrow \infty} S_n .

Details and assumptions

Note: The initial term 11 \frac {1}{1} occurs because the empty product (product of no terms) is defined to be 1.

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