Q.

If the lines L1 and L2 are given by 

r = (i + 2j - k)+t(2i - 3j + k) and 

r = (i + j + k) + s( 2i + j - k), then

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a

(L1, L2) = 450 

b

L1 and L2 are perpendicular 
 

c

(L1, L2) = 600 

d

L1 and L2 are parallel 
 

answer is A.

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Detailed Solution

a=2i-3j+k      b=2i+j-k a.b=4-3-1=0  a, b are Ler

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