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1-1/2-1/6-1/12-1/12-1/20-1/30
=1-[1/(1×2)+1/(2×3)+1/(3×4)+..1/(5×6)]
=1-﹙1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=1-(1-1/6)
=1/6
=1-[1/(1×2)+1/(2×3)+1/(3×4)+..1/(5×6)]
=1-﹙1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=1-(1-1/6)
=1/6
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