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

The harmonic mean of \(\frac{a}{1 - ab}\) and \(\frac{a}{1 + ab}\) is equal to

1
\(\frac{a}{\sqrt{1 - a^2b^2}}\)
2
\(\frac{a}{1 - a^2b^2}\)
3
a
4
\(\frac{1}{1 - a^2b^2}\)
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