What is the equation of the hyperbola with center at (2, -3), vertical transverse axis, vertices at (2, -1) and (2, -5), and foci at (2, 0) and (2, -6)?
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What are the characteristics of a hyperbola with center (-3,4), horizontal transverse axis length 10, and eccentricity 3?
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What is the number of ways to arrange 5 books on a shelf, out of a set of 10 books?