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Let S and S' be the foci of an ellipse and B be any one of the extremities of its minor axis. If Δ S'BS is a right angled triangle with right angle at B and area ( Δ S'BS) = 8 sq. units, then the length of a latus rectum of the ellipse is :

1. 2
2. 2 4
3. 4
4. 2 2

Correct answer: 4

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