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Using determinant : Show that the poi...

Using determinant :
Show that the points (a,b+c),(b,c+a) and (c,a+b) are collinear .

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The correct Answer is:
`|{:(" "16,-12,-8),(-1,-6," "5),(-21," "18,-3):}|;|{:(" "-4/9," "1/2," "2/9),(" "1/36," "1/6,-5/36),(" "7/12,-1/2," "1/12):}|`
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