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Q.

The point of intersection of the lines x-41=y+3-4=z+17 and x-12=y+1-3=z+108 is

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a

(5, 7, 6)

b

(5, - 7, 6)

c

(5, 6, 7)

d

(- 5, 6, 7)

answer is B.

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Detailed Solution

x-41=y+3-4=a+17=kx=k+4,  y=-4k-3,  z=7k-1x-12=y+1-3=z+108=lx=2l+1, y=-3l-1, z=8l-10k+4=2l+1  2l-k-3=0                -(1)-4k-3=-3l-1  3l-4k-2=0          -(2)

(1)×4  8l-4k-12=0                    3l-4k-2=0     5l-10=0                                    l=2

Point of intersection of lines P(5, -7, 6)

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