1.

Let a, b, g be the distinct real numbers. The points with position vectors abar(i)+b""bar(j)+gbar(k), b""bar(i)+gbar(j)+abar(k), gbar(i)+abar(j)+b""bar(k) are

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Collinear
form an ISOSCELES triangle
fom a RIGHT ANGLED triangle
form an EQUILATERAL triangle

Answer :D


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