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$(1 - \frac{1}{2^{2}}) (1 - \frac{1}{3^{2}}) (1 - \frac{1}{4^{2}})$ …… $(1 - \frac{1}{19^{2}}) (1 - \frac{1}{20^{2}})$ =?

1
0.5222
2
0.552
3
0.525
4
0.555

Answer:- 3

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