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Find the sum: 1/2+1/6+1/(12)+1/(20)+1...

Find the sum: `1/2+1/6+1/(12)+1/(20)+1/(30)+1/(42)+1/(56)+1/(72)+1/(90)+1/(110)+1/(132)` `7/8` (b) `(11)/(12)` (c) `(15)/(16)` (d) `(17)/(18)`

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