1.

If veca = (1)/(sqrt10) (3 hati + hatk) and vecb =1/7 (2 hati + 3 hatj - 6 hatk), then the value of (2 veca - vecb). [ (veca xx vecb) xx (veca + 2 vecb] is :

Answer»

`-5`
`-3`
`5`
`3.`

ANSWER :A


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