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sparkle6: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Tue Sep 20, 2011 7:58 amFollowed by: 1 member; Thanked: 1 times

by sparkle6 » Sun Sep 25, 2011 6:23 am

Meg and Bob are among the 5 participants in a cycling race. If each participant finishes the race and no two participants finish at the same time, in how many different possible orders can the participants finish the race so that Meg finishes ahead of Bob?

A. 24
B. 30
C. 60
D. 90
E. 120

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Source: Beat The GMAT — Problem Solving | Sun Sep 25, 2011 6:23 am

shankar.ashwin: Legendary Member; Posts: 966; Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members; Thanked: 230 times

by shankar.ashwin » Sun Sep 25, 2011 6:28 am

5!/2 (5! gives total ways, in exactly half the cases Meg will finish ahead of Bob)

C

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navami: Legendary Member; Posts: 540; Joined: Sat Dec 20, 2008 7:24 pmFollowed by: 6 members; Thanked: 37 times

by navami » Mon Sep 26, 2011 2:17 am

IMO 60

This time no looking back!!!
Navami

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