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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
1 year, 6 months 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? Staff · 1 year, 6 months ago

sir, I am still trying · 1 year, 6 months ago