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If veca=i+j+k,veca.vecb=1 and vecaxxvecb...

If `veca=i+j+k,veca.vecb=1` and `vecaxxvecb=j-k`, then : `vecb`=

A

`hati-hatj+hatk`

B

`2hatj-hatk`

C

`hati`

D

`2hati`

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