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)/(c)-(1)/(a))((1)/(c)+(1)/(a)-(1)/(b))` is

A

`4/(ac) - 3/b^2`

B

`4/(ac) + 3/b^2`

C

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

D

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

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The correct Answer is:

A

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