The vector a1i + a2j + a3k and b1i + b2j + b3k are perpendicular to ea – InterviewSolution

1.	The vector a1i + a2j + a3k and b1i + b2j + b3k are perpendicular to each other if:(A) a1/b1 = a2/b2 = a3/b3(B) a1b1 + a2b2 + a3b3(C) a1b2 + b2a1 + a3b2 = 0(D) None of these
Answer» Answer is (B) a₁b₁ + a₂b₂ + a₃b₃

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