Probability Man Guide

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chaitanya.mehrotra: Master | Next Rank: 500 Posts; Posts: 184; Joined: Thu Nov 25, 2010 9:57 pmFollowed by: 5 members; Thanked: 1 times; GMAT Score:700

by chaitanya.mehrotra » Fri Jul 29, 2011 6:36 am

In a bag of marbles, there are 3 red, 2 white, and 5 blue. If Bob takes 2 marbles out of
the bag, what is the probability that he will have one white and one blue marble?

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Source: Beat The GMAT — Problem Solving | Fri Jul 29, 2011 6:36 am

sunnyjohn: Master | Next Rank: 500 Posts; Posts: 344; Joined: Mon Sep 14, 2009 5:40 amFollowed by: 3 members; Thanked: 28 times; GMAT Score:700

by sunnyjohn » Fri Jul 29, 2011 7:28 am

Total number of outcomes: 10(c)2 ==> 45

1 white and 1 blue = 2(c)1 * 5(c)1 ==> 2*5 = 10

Answer: 10/45 ==> 2/9

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