(3^-1 + 4^-1 + 5^-1)^-1
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Step-by-step explanation:
(3^-1 + 4^-1 + 5^-1)^-1
= (1/3+1/4+1/5)^-1
= [(20+15+12)/60]^-1
=(47/60)^-1
=60/47
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