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Proof Problem #3

If \(1 + 1/2 + 1/3 + .... + 1/100 = A/B\) where gcd(A,B) = 1 then show that \(AB\) isn't divisible by 5

Note by Dev Sharma
2 years ago

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That's an interesting question. What have you tried? Is it obvious that A is not divisible by 5? Is it obvious that B is not divisible by 5?

Calvin Lin Staff - 2 years ago

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sir, I am still trying

Dev Sharma - 2 years ago

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oh i failed to try it

Yudi Kuswara - 1 year, 11 months ago

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