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If $$p, q, r, s$$ are in harmonic progression and $$p > s$$, then
$$\left(\frac{1}{ps}\right) < \left(\frac{1}{qr}\right)$$
$$q + r = p + s$$
$$\left(\frac{1}{q}\right) + \left(\frac{1}{p}\right) = \left(\frac{1}{r}\right) + \left(\frac{1}{s}\right)$$
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