If \( T_{n}=\frac{n}{(n+1) !} \) then \( \sum_{n=1}^{20} t_{n}= \) ...

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If \( T_{n}=\frac{n}{(n+1) !} \) then \( \sum_{n=1}^{20} t_{n}= \)
\( \mathrm{P} \)
W
(1) \( \frac{20 !-1}{20 !} \)
(2) \( \frac{21 !-1}{21 !} \)
(3) \( \frac{1 !}{2(20-1) !} \)
(4) None of these
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