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The surface of a sphere subtends a solid angle of what amount at its center:

1. π
2. 2π
3. 4π
4. ½ π

Answer: C

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Which of the following properties would you use to compute the chances of rolling either a 7 or an 11 with a pair of dice:	Assuming a year in a dogs life is equivalent to 7 years of a humans life, what is 1 hour of a dogs life approximately equivalent to in a humans life?