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For every point P(x ,\ y ,\ z) on the ...

For every point `P(x ,\ y ,\ z)` on the xy-plane, a. `x=0` b. `y=0` c. `z=0` d. `x=y=z=0`

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`Z = 0`

Because Z- co ordinate of all points on `XY` plane is `0`
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