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Let one focus of the hyperbola H : 2 2 2 2 b y a x − = 1 be at ( 10 , 0) and the corresponding directrix be x = 10 9 . If e and l respectively are the eccentricity and the length of the latus rectum of H, then 9(e 2 + l ) is equal to :

1. 15
2. 14
3. 12
4. 16

Correct answer: 16

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