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If bc + ab + ca = ab,c then the above o...

If `bc + ab + ca = ab,c ` then the above of `(b +c)/( bc (a - 1)) + (a + c)/( a c (b - 1)) + ( a +b )/( ab (c -1))` is

A

`-2/3`

B

1

C

0

D

`-1/2`

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CHAMPION PUBLICATION-2014 TIER-II PAPER(18)-EXERCISE
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