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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

(-2,3)

B

(3, -2)

C

(-3,2)

D

(2,-3)

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The correct Answer is:
C
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