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If a ,b ,a n dc are in H.P., then th val...

If `a ,b ,a n dc` are in H.P., then th value of `((a c+a b-b c)(a b+b c-a c))/((a b c)^2)` is `((a+c)(3a-c))/(4a^2c^2)` b. `2/(b c)-1/(b^2)` c. `2/(b c)-1/(a^2)` d. `((a-c)(3a+c))/(4a^2c^2)`

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