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Consider the following 3 lines in space ...

Consider the following 3 lines in space `L_1:vecr=3 hati-hatj+2 hatk+lambda(2 hati+4hatj-hatk) L_2:vecr=hati+hatj-3 hatk+mu(4hati+2hatj+4hatk)L_3: vecr=3hati+2hatj-2hatk+t(2hati+hatj+2hatk)` Then which one of the following pair(s) are in the same plane.

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