If the points (1,1,-3) and (1,0, -3) lie...

If the points `(1,1,-3) and (1,0, -3)` lie on opposite sides of the plane `x + y + 3z + d=0 ` then

A

`d lt 7`

B

` d gt 8`

C

`7 lt d lt 8`

D

` d lt 7 or d gt 8`

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The correct Answer is:

C

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