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[[x(1),y(1),1],[x(2),y(2),1],[x(3),y(3),...

`[[x_(1),y_(1),1],[x_(2),y_(2),1],[x_(3),y_(3),1]] = 0`is the condition that the points
`(x_(i), y_(j)), i=1,2,3`

A

form an equilateral triangle

B

are collinear

C

form a angled triangle

D

`(x_(2), y_(2))` is the | point of the line joining `(x_(1), y_(1))` and `(x_(3), y_(3))`

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The correct Answer is:
B
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