Solution
If X1,X2,X3 are in harmonic mean
harmonic mean=$$\frac{n}{x1}±\frac{n}{x2}±\frac{n}{x3}$$
Therefore harmonic mean of $$\frac{1}{x}$$ and $$\frac{1}{y}$$
is $$\frac{x+y}2$
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