1.

If overset(to) (a) = hat(i) + 2 hat(j) + hat(k) and overset(to)(b) = hat(i) - 2 hat(j) - 3 hat(k) then ( overset(to)(a) + overset(to)(b) ). ( overset(to)(a) - overset(to)(b) ) = …......

Answer»

`-2`
`-8`
`8`
`2`

ANSWER :B


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