Math Olympiad | Find the sum without using a Calculator | VIJAY Maths

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[@RyanLewis-Johnson-wq6xs]

1/10+1/12+1/20+1/30+1/42+1/56+1/72+1/90=0.3 recurring=1/3

[@yakupbuyankara5903]

1/3

[@kareolaussen819]

1/10+(1/3-1/4)+(1/4-1/5)+...+(1/9-1/10)=1/3