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If x+y +z=0, then (x+y) (y+z) (z+x) is ...

If `x+y +z=0`, then `(x+y) (y+z) (z+x)` is equal to which of the following:

A

`S_(11)` is an odd number

B

`S_(13)` is a negative number

C

`S_(15)` is an even number

D

both (b) and (c)

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The correct Answer is:
D
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