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Let x = 2t, y = 3 t 2 be a conic. Let S be the focus and B be the point on the axis of the conic such that SA ⊥ BA, where A is any point on the conic. If k is the ordinate of the centroid of the Δ SAB, then 1 t lim → k is equal to

1. 18 17
2. 18 19
3. 18 11
4. 18 13

Correct answer: 18 13

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