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If a, b, c are in H.P, then the value of...

If a, b, c are in H.P, then the value of (1/(b) + 1/(a) - 1/(c)) (1/(b) + 1/(c) -1/(a) ) is

A

`3/b^2-2/(ab)`

B

`a^2+b^2+c^2`

C

`2/(bc)-1/b^2`

D

both (a) and (c)

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The correct Answer is:
D
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