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Questions  

The lines x=py+q,z=ry+s and x=p1y+q1,z=r1y+s1 are perpendicular if

a
pp1+rr1=0
b
pp1+rr1=1
c
pp1+rr1+1=0
d
pp1=rr1+1

detailed solution

Correct option is C

x−qp=y1=z+sr;x−q1p1=y1=z+s1r1a1a2+b1b2+c1c2=0

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