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Questions  

 The equation (5x1)2+(5y2)2=λ22λ+1(3x+4y1)2 represents an ellipse if λ

a
0,1
b
(0,2) - 1
c
1,2
d
-1,0

detailed solution

Correct option is B

The given equation isx−152+y−252=(λ−1)23x+4y−132+422 or x−152+y−252=|λ−1||3x+4y−1|32+42 For an ellipse, SP=ePM, where 0

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 The equation of the ellipse having focus (1,1), directrix xy3=0 and eccentricity 1/2 is 


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