The points (–a, –b), (0, 0), (a, b) and (a^2, ab) are
A
vertices of a rectangle
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B
vertices of a parallelogram
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C
collinear
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D
none of these
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Solution
The correct option is C collinear LetA≡(−a,−b),B≡(0,0)c≡(a,b)andD≡(a2,ab)Then,slopeofAB=ba,slopeofBC=baandslopeofCD=ab−ba2−a=b(a−1)a(a−1)=ba Thus, the points A, B, C and D are collinear