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vectors veca=i-j+2k , vecb=2i+4j+k and v...

vectors `veca=i-j+2k , vecb=2i+4j+k` and `vecc=lambdai+j+muk` are mutually orthogonal then `(lambda,mu)` is

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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