Mathematics · Progression

If a, b, c, d are in H.P. (Harmonic Progression), then the value of (1/a2 − 1/d2)(1/b2 − 1/c2)−1 is:

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14
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32
41

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If a, b, c, d are in H.P. (Harmonic Progression), then the value of (1/a2 − 1/d2)(1/b2 − 1/c2)−1 is:

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If a, b, c, d are in H.P. (Harmonic Progression), then the value of (1/a2 − 1/d2)(1/b2 − 1/c2)−1 is:

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