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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

(- 3, 2)

B

(2, - 3)

C

(- 2, 3)

D

(3, - 2)

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A
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