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What is the value of the following ex...

What is the value of the following expression? `1/((2^2-1))+1/((4^2-1))+1/((6^2-1))+\ +1/((20^2-1))` `9/(19)` (b) `(10)/(19)` (c) `(10)/(21)` (d) `(11)/(21)`

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