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(1-1/4)×(1-1/9)×(1-1/16)×(1-1/25)×(1-1/36)×(1-1/49) =1×3/2²;×2×4/3²;×3×5/4²;×4×6/5²;×5×7/6²;×6×8/7²; =1/2×8/7 =4/7
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