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vladmire: Master | Next Rank: 500 Posts; Posts: 132; Joined: Tue Oct 07, 2008 4:59 pm; Thanked: 4 times

by vladmire » Wed Dec 17, 2008 6:15 pm

What understanding of probabilty do I need to know?

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Source: Beat The GMAT — Problem Solving | Wed Dec 17, 2008 6:15 pm

amitabhprasad: Master | Next Rank: 500 Posts; Posts: 259; Joined: Thu Jan 18, 2007 8:30 pm; Thanked: 16 times

by amitabhprasad » Wed Dec 17, 2008 6:45 pm

Possible solutions of the equation are
x = 5, x = -10, x = 2.5 of these only -10 and 2.5 part of given list of 12 numbers
probability = 2/12 = 1/6

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