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Q.

Let x2+y2=20 be the director circle of an ellipse E whose major axis is X - axis and minor axis is Y-axis. If the length of the latus rectum of E is 2, then the distance between its foci is 

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a

42

b

43

c

45

d

3

answer is B.

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Detailed Solution

Equation of director circle is 

x2+y2=2a2

Given director circle is x2+y2=20

2a2=20 a2=10

2ae=43

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