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$(1 - \frac{1}{3}) (1 - \frac{1}{4}) (1 - \frac{1}{5}) . . . . . . (1 - \frac{1}{3}) = ?$

1
$\frac{1}{n}$
2
$\frac{2}{n}$
3
$\frac{2 (n - 1)}{n}$
4
$\frac{2}{n (n + 1)}$

Answer:- 2

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