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Q.

If r=i+j+t(2i-j+k) and r=2i+j-k+s(3i-5 j+2k) are the vector equations of two lines L1 and L2, then the shortest distance between them is

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a

959

b

1059

c

1159

d

0

answer is B.

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Detailed Solution

a=p+j               b=2i-j+k c=2i+j-k        d=3i-5j+2k a-c=i-k         b×d=ijk2-113-52                          =i(3) -j(1)+k(-7) S.D=3+79+1+49=1059

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If r=i+j+t(2i-j+k) and r=2i+j-k+s(3i-5 j+2k) are the vector equations of two lines L1 and L2, then the shortest distance between them is