Red One
Saturday, September 4th, 2010
What is the probability that at least one of the other two red?
Situation 1: You have four balls. You know that one of them is red. The other three are green. Two of the four are drawn at random. What is the probability that at least one of the remaining balls red? Scenario 2: You has four balls. You know two of them are red. The other two are green. Two of the four are drawn at random. What is the probability that at least one of the remaining balls are red? Please show the math. I try to do an analysis on a variety of similar situations. I just need to understand what measures are the problem. Thanks!
q1 P] [> 1 red = = 1 - [3 balls of greens to choose 2] / [with four balls to choose 2] = 1 – 3C2 / 4C2 = 1-3 / 6 = 1 / 2 Q2 P [> = 1] = Red [2 to choose a red] * [Choose from 2 Green 1 / [four balls to choose 2] = 2C1 * 2C1 / 4C2 = 4 / 6 = 2 / 3 Note: Q1 also could hv been resolved which generally T2 P [> 1 = red] = [1 1 red select] * [select one green from3] / [4 ball choose 2] = 1 * 3 / 6 = 1 / 2
MIKA, RedOne – Kick Ass (We Are Young)
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