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If (x^2+y^2+z^2-64)/(x y-y z-z x)=-2 and...

If `(x^2+y^2+z^2-64)/(x y-y z-z x)=-2` and `x+y=3z` , then the value of `z` is (a) 2 (b) 3 (c) 4 (d) None of these

A

2

B

3

C

4

D

None of these

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C
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