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July 4, 2015

Homework Help: Maths

Posted by Ian on Monday, April 15, 2013 at 3:33am.

A bag contains 10 red marbles, 10 green marbles, 10 yellow marbles and 10 blue marbles. You reach into the bag and grab a marble, then reach into the bag and grab a second marble. The probability that the second marble is the same color as the first marble is ab, where a and b are positive, coprime integers. What is the value of a+b?

Note: You do not place the first marble back into the bag

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