If veca=hati+hatj-lambdahatk and vecb=2h...

If `veca=hati+hatj-lambdahatk` and `vecb=2hati+lambdahatk` are per[endicular to each other, the value of `lambda` is :

A

`+-1`

B

`+-sqrt2`

C

`+-sqrt3`

D

None of these

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