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The pairs of straight lines $x^{2} - 3 xy + 2 y^{2} = 0$ and $x^{2} - 3 xy + 2 y^{2} + x - 2 = 0$ form a :

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square but not rhombus

rhombus

parallelogram

rectangle but not a square

answer is C.

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Detailed Solution

$a + b \neq 0, (a - b) f g + h (f^{2} - g^{2}) \neq 0$

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