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Question

The foci of the ellipse 25x2+36y2=225 are

A
(±1211,0)
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B
(±52,0)
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C
(0,±1211)
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D
(0,±52)
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Solution

The correct option is A (±1211,0)
Given ellipse is, 25x2+36y2=225
x2(3)2+y2(5/2)2=1
a=3,b=52e=1b2a2=116
Therefore, foci of the ellipse are (±ae,0)(±1211,0)

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