Find the length of the major axis of an ellipse with a vertical major axis, when the coordinates of the foci are (0, ±9) and the distance between a focus and a vertex is 15.
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Math question: What is the probability of rolling a fair six-sided die and getting an odd number?
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Math Question: What is the measure of an inscribed angle in a circle if the angle intercepts an arc with a measure of 60°?