1.

bar(a), bar(b), bar(c) are three vectors of which every pair is non-collinear. If the vectors bar(a)+bar(b), bar(b)+bar(c) are collinear with bar(c), bar(a) respectively, then bar(a)+bar(b)+bar(c)=

Answer»

`BAR(a)`
`bar(B)`
`bar(C)`
`bar(0)`

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