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2016 Chandigarh RMO 1/a + 1/b +1/c<1 =>1/a + 1/b +1/c<= 41/42

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August 9, 2019
inequalitiesalgebra

Problem Statement

Positive integers a,b,ca, b, c satisfy 1a+1b+1c<1\frac1a +\frac1b +\frac1c<1. Prove that 1a+1b+1c4142\frac1a +\frac1b +\frac1c\le \frac{41}{42}. Also prove that equality in fact holds in the second inequality.