1/42+1/56+1/72+1/90+1/110
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1/42+1/56+1/72+1/90+1/110
1/42+1/56+1/72+1/90+1/110
1/42+1/56+1/72+1/90+1/110
1/42+1/56+1/72+1/90+1/110
=(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)+(1/10-1/11)
=1/6-1/11
=11/66-6/66
=5/66
1/42+1/56+1/72+1/90+1/110
=(1/6-1/7)+(1/7-1/8)+(1/9-1/10)+(1/10-1/11)
=1/6-1/11
=11/66-6/66
=5/66
5/66