If the vectors vec a = i-j+2k, vec b = 2...

If the vectors `vec a = i-j+2k, vec b = 2i+4j+k` and `vec c = lambda i + j + mu k ` are mutually perpendicular then `(lambda, mu) =`

A

{-3, 2}

B

{2, -3}

C

{-2, 3}

D

{3, -2}

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The correct Answer is:

A

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