Let →a, →b and →c are three nonzero, non collinear vectors. If t – InterviewSolution

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1.	Let →a, →b and →c are three nonzero, non collinear vectors. If the vector 3 →a+7 →b is collinear with →c and 3 →b+2→c is collinear with →a, then ∣∣9 →a+21 →b+14 →c∣∣ is equal to
Answer» Let $\to a, \to b$ and $\to c$ are three nonzero, non collinear vectors. If the vector $3 \to a + 7 \to b$ is collinear with $\to c$ and $3 \to b + 2 \to c$ is collinear with $\to a$ , then $∣ ∣ 9 \to a + 21 \to b + 14 \to c ∣ ∣$ is equal to

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