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एक दीर्घवृत्त की एक नाभि मूलबिंदु पर है | नियता का समीकरण x = 4 तथा उत्केन्द्रता `1//2` है | तब अर्द्ध-दीर्घ अक्ष की लम्बाई है-
A. `5//3`
B. `8//3`
C. `2//3`
D. `4//3`

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