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If the two vectors $\vec{A} = 2 \hat{i} + 3 \hat{j} + 4 \hat{k}$ and $\vec{B} = \hat{i} + 2 \hat{j} - n \hat{k}$ are perpendicular then the value of n is

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Correct option is B

The vectors will be perpendicular if A→.B→=0 ∴ (2i^+3j^+4k^).(i^+2j^−nk^)=0 or 2+6−4n=0 or n=2

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If the two vectors A→=2i^+3j^+4k^ and B→=i^+2j^−nk^ are perpendicular then the value of n is

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If the two vectors $\vec{A} = 2 \hat{i} + 3 \hat{j} + 4 \hat{k}$ and $\vec{B} = \hat{i} + 2 \hat{j} - n \hat{k}$ are perpendicular then the value of n is