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Rockying**: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Sun Sep 04, 2011 5:08 am

by Rockying** » Sun Sep 04, 2011 5:08 am

14 One number, n, is selected at random from a set of 10 integers. What is the probability that Â½ n + 13 = 0?

The largest integer in the set is 13.
The arithmetic mean of the set is zero.

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Source: Beat The GMAT — Data Sufficiency | Sun Sep 04, 2011 5:08 am

cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 amFollowed by: 123 members; Location: India; Thanked: 310 times; GMAT Score:750

by cans » Mon Sep 05, 2011 4:50 am

Â½ n + 13 = 0 => n=-26.
a) largest =13. but maybe all others are -26 or none of them is -26. insufficient
b) maybe numbers are -5,5,-5,-5 and so on. or maybe numbers are -26,26,-26,26... insufficient
a&b) maybe numbers are 13,-13,13,-13....
or maybe numbers are -26,13,13,5,-3,-2,4,-4,4,-4. Insufficient
IMO E

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