1/3 + 1/15 + 1/35 + 1/63 + 1/99 + 1/143 = x/y. Find y square - x square.
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Answer: 1 15+135+163+199+1143=539. Explanation: 115+135+1 63+199+1143. = 13×5+15×7+17×9+19×11+111×13.
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