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An ellipse has latus rectum 3 and eccentricity 1/2. Its semi-major axis is
A1
B2
C3
D4
Answer & Solution
Correct answer: B. 2
b² = a²(1 - 1/4) = 3a²/4, so 2b²/a = 3a/2 = 3 and a = 2.
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