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Let a and b be bonzero real numbers. The...

Let a and b be bonzero real numbers. Then the equation `(ax^(2)+by^(2)+c)(x^(2)-5xy+6y^(2))=0` represents

A

four straight lines when c=0 and `ab gt 0`

B

two straight lines and a circle when a=b ad `ac lt 0`

C

two straight lines and a hyperbola when `ab gt 0" and "ac lt0`

D

a circle and an ellipse when `ab gt 0" and "ac lt 0`

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The correct Answer is:
B
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