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Question

Equation of a plane which passes through the point of intersection of lines
x−13=y−21=z−32 and x−31=y−12=z−23 and at greatest distance from the origin is

A
7x+2y+4z=54
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B
4x+3y+5z=50
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C
3x+4y+5z=49
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D
x+y+z=12
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Solution

The correct option is B 4x+3y+5z=50
L1:x13=y21=z32

L2:x31=y12=z23

Any point on L1(3k1+1,k1+2,2k1+3)
Any point on L2(k2+3,2k2+1,3k2+2)
3k1+1=k2+3
3k1k22=0....(i)
k1+2=2k2+1
k12k2+1=0......(ii)
(i)×(ii)
6k12k24=0k12k2+1=0+5k1=5
k1=1
point of intersection is (4,3,5)
PO=^n
Direction of OP (4,3,5)
Equation of point is
4(x4)+3(y3)+5(z5)=0
4x+3y+5z=50

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