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

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a

d<7

b

d>8

c

7

d

d<7 or d>8

answer is C.

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Detailed Solution

d-7 and d-8 must have opposite signs ⇒7
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If the points (1, 1, -3) and (1, 0, -3) lie on opposite sides of the plane x+y+3z+d=0 then