Teaching DSSSB TGT Mock Test 2025 Mathematics Sequences and Series Harmonic Progressions

If a, b, c, d are in H.P., then the value of \(\left(\frac{1}{a^2}-\frac{1}{d^2}\right)\left(\frac{1}{b^2}-\frac{1}{c^2}\right) ^{-1} \) is:

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