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1

Part of 1991 Mexico National Olympiad

Problems(1)

sum of all positive irreducible fractions <1 with denominator 1991

Source: Mexican Mathematical Olympiad 1991 OMM P1

7/29/2018
Evaluate the sum of all positive irreducible fractions less than 11 and having the denominator 19911991.
number theoryFractionsIrreducible