Question

$if \: {3}^{x} = {5}^{y} = {15}^{ - z} \: then \: \frac{1}{x} + \frac{1}{y} + \frac{1}{z} \: is \: equal \: to$
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Answer 1

Answer:

$sorry \: but \: plz \: type \: neatly$

plz