1.

The position vectors of the three non-collinear points A, B, C, are bara, barb, barc respectively. The distance of the origin from the plane through A, B, C is

Answer»

`[bara BARB barc]`
`(abs([bara barb barc]))/([baraxxbarb+barbxxbarc+barcxxbara])`
`abs(([bara barb barc])/(baraxxbarb+barbxxbarc+barcxxbara))`
`2[bara barb barc]`

Answer :C


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