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If the vectors a=hat(i)-hat(j)+2hat(k), ...

If the vectors `a=hat(i)-hat(j)+2hat(k), b=2hat(i)+4hat(j)+hat(k) and c=lambdahat(i)+hat(j)+muhat(k)` are mutually orthogonal, then `(lambda, mu)` is equal to

A

`(-3,2),(3,-2)`

B

`(2,-3)`

C

`(-2,3)`

D

`(3,-2)`

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