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If bara=hati+hatj+hatk, barb=2hati+lambd...

If `bara=hati+hatj+hatk, barb=2hati+lambdahatj+hatk,barc=hati-hatj+4hatk and bara.(barbxxbarc)=10`, then `lambda` is equal to

A

6

B

7

C

9

D

10

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A
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