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Question

Assertion :C:(ax2+by2+c)(ay2bx)=0; a and b are nonzero real numbers.
C represents a parabola and a pair of perpendicular lines if c=0 and a and b are of opposite signs. Reason:

C:(ax2+by2+c)(ay2bx)=0; a and b are nonzero real numbers.
C represents a parabola and a hyperbola if a and b are of opposite signs.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Given equation represents

ax2+by2+c=0,y2=bax

Now When c=0, and a and b are of opposite sign ax2+by2=0

represent a pair of straight lines and y2=bax represent a parabola..

Next, when a & b are of the opposite sign

ax2+by2=cx2c/ay2c/b=1

ab<0, so it represents a hyperbola.

and y2=bax represent a parabola.

So both assertion and Reason are independently true.
Hence the correct choice is an option B

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