GRE Exam Numerical Ability Probability

A spinner divided into equal sections numbered 0 through 8 is spun 3 times. What is the probability that the spinner lands on a prime number all three times?

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GRE Other Question
An investor divides $12,000 into two investments, one paying 7% and one 8% annually. At the end of the year she has made $870. How much did she invest at 8%? In a certain village, m litres of water are required per household per day. At this rate, if there are n households in the village, how long (in months of 30 days) will p litres of water last? A) 30p/(mn) B) 30pm/n C) p/(30mn) D) pn/(30m)