If x(1), x(2), x(3) and y(1),y(2), y(3) ...

If `x_(1), x_(2), x_(3)` and `y_(1),y_(2), y_(3)` are in arithmetic progression with the same common difference then the points `(x_(1),y_(1)) (x_(2),y_(2)) (x_(3), y_(3))` are:

collinear

vertices of equilateral triangle

vertices of an isosceles triangle

none

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