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Q.

A point on the line r=(1-t)(2i+3j+4k) +t(3i-2j+2k) is

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a

-i+5j+2k

b

i+6j+8k

c

i+8j+6k

d

i-8j+6k

answer is C.

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Detailed Solution

r=2i+3j+4k+y(i-5j-2k) 1)   r=-i+5j+2k     2t=-1  3-5t=5       t=-3  t=-25  not equal to  2)  r=i+6j+8k     2+t=1  3-5t=6       t=-1  5t=-35 not possible  3)  r=i+8j+6k    2+t=1  3-5t=8  4-2t=6      t=-1    t=-1     2t =-2  t=-1  optim 3 correct 

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