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

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

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## Comments

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TopNewestThat'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 · 1 year, 1 month ago

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– Dev Sharma · 1 year, 1 month ago

sir, I am still tryingLog in to reply

oh i failed to try it – Yudi Kuswara · 1 year ago

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