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If the harmonic mean between a and \(\ b \) be \(\ H \), then the value of \(\ \frac{1}{H-a}+\frac{1}{H-b} \) is

Q1

If the harmonic mean between a and \(\ b \) be \(\ H \), then the value of \(\ \frac{1}{H-a}+\frac{1}{H-b} \) is

a

\(\ a+b \)

b

ab

c

\(\ \frac{1}{a}+\frac{1}{b} \)

d

\(\ \frac{1}{a}-\frac{1}{b} \)

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