If ^i+^j+^k, 2^i+5^j, 3^i+2^j−3^k, ^i−6^j−^k respectively are – InterviewSolution

1.	If ^i+^j+^k, 2^i+5^j, 3^i+2^j−3^k, ^i−6^j−^k respectively are the position vectors of points A, B, C and D, then find the angle between the straight lines AB and CD. Find whether −−→AB and −−→CD are collinear or not.
Answer» $If^i +^j +^k,$ $2^i + 5^j,$ $3^i + 2^j - 3^k,$ $^i - 6^j -^k$ respectively are the position vectors of points $A,$ $B,$ $C$ and $D,$ then find the angle between the straight lines $A B$ and $C D .$ Find whether $- - \to A B$ and $- - \to C D$ are collinear or not.

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