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Q.

In an ellipse the distance between the foci is 8 and the distance between the directrices is 25. Then length of major axis, is

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a

302

b

102

c

202

d

none of these

answer is A.

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Detailed Solution

lt is given that  2ae=8 and 2ae=25

⇒ 2ae×2ae=8×25⇒4a2=200⇒a=52⇒2a=102.

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