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If lambdahati+2lambdahatj+2lambdahatk is...

If `lambdahati+2lambdahatj+2lambdahatk` is a unit vector,then the value of `lambda` is

A

`(1)/(3)`

B

`(1)/(4)`

C

`(1)/(9)`

D

`(1)/(2)`

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