Let a, β,γ be distinct real numbers. The points with position vectors ai + βj+γk,βi+γj+ak,γi+aj+βk.
A
are collinear
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B
form an equilateral triangle
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C
form an scalene triangle
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D
form a right angled triangle
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Solution
The correct option is C form an equilateral triangle ∣∣∣−−→AB∣∣∣=[(α−β)2+(β−y)2+(y−α)2]12 ∣∣∣−−→BC∣∣∣=[(β−y)2+(y−α)2+(α−β)2]12 ∣∣∣−−→CA∣∣∣=[(α−y)2+(β−α)2+(y−β)2]12