GRE Exam Numerical Ability Probability

A box contains 6 red, 4 white and 5 black balls. A person draws 4 balls at random. Find the probability that among the four balls, there is at least one of each colour.

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GRE Other Question

Jeff takes 20 minutes to jog around the race course one time, and 25 minutes to jog around a second time. What is his average speed in miles per hour for the whole jog if the course is 3 miles long? Meena has to eat only one fruit out of three. The probability that she eats a banana is 3/2 times the probability that she eats an apple. The probability that she eats a guava is half the probability that she eats a banana. What is her probability of having an apple?