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If ( xy)/( x + y) = a , ( xz)/( x + z) =...

If `( xy)/( x + y) = a , ( xz)/( x + z) = b and ( yz)/( y + z) = c ` where a, b, are all non-zero numbers, then x equals to

A

`(2abc)/(ac+bc-ab)`

B

`(2abc)/(ab-ac+bc)`

C

`(2abc)/(ab+bc+ac)`

D

`(2abc)/(ab+ac-bc)`

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The correct Answer is:
A
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LUCENT PUBLICATION-ALGEBRAIC IDENTITIES -Exercise - 1A
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