1.

If bara=(1)/(sqrt10)(3overset(^)i+overset(^)k),barb=1/7(2overset(^)i+3overset(^)j-6overset(^)k), then the value of (2bara-barb).{(baraxxbarb)xx(bara+2barb)} is

Answer»

`-5`
`-3`
5
2

Answer :A


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