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How much is 1 / 1x2x3 + 1 / 2x3x4 + 1 / 3x4x5 + 1 / 4x5x6 +... + 1 / 8x9x10?
1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+...+1/8x9x10 =1-1/2-1/2(1-1/3)+1/2-1/3-1/2(1/2-1/4)+1/3-1/4-1/2(1/3-1/5)+1/4-1/5-1/2(1/4-1/6)+.+1/8-1/9-1/2(1/8-1/10)=1-1/9-1/2(1+1/2-1/9-1/10)=173/360
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