1.

If overline(a), overline(b) and overline(c) are three coplanar vectors, then (overline(a)+overline(b))*(((overline(b)+overline(c))timesoverline(a)+(overline(b)+(overline(a))timesoverline(b)))=

Answer»

`0`
`[[OVERLINE(a), overline(b), overline(c)]]`
`2[[overline(a), overline(b), overline(c)]]`
`-[[overline(a), overline(b), overline(c)]]`

Answer :A


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