combinatorics 4

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Gurpinder: Legendary Member; Posts: 659; Joined: Mon Dec 14, 2009 8:12 amFollowed by: 3 members; Thanked: 32 times

by Gurpinder » Thu Jul 29, 2010 7:47 am

Meredith and 5 of her friends are taking a road trip in their minivan. If each row holds 3 people, how many different rows of 3 people can be filled?

oa: 20

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Source: Beat The GMAT — Problem Solving | Thu Jul 29, 2010 7:47 am

kmittal82: Master | Next Rank: 500 Posts; Posts: 324; Joined: Mon Jul 05, 2010 6:44 amFollowed by: 3 members; Location: London; Thanked: 70 times

by kmittal82 » Thu Jul 29, 2010 8:04 am

I think it boils down to selecting 3 people from 6
= 6C3 = 6!/(3!3!) = 20

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Gurpinder: Legendary Member; Posts: 659; Joined: Mon Dec 14, 2009 8:12 amFollowed by: 3 members; Thanked: 32 times

by Gurpinder » Thu Jul 29, 2010 8:09 am

omg.....

i made a silly error. i wasn't counting medrith in the 5 friends. hahahahha....... someone just kill me

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kmittal82: Master | Next Rank: 500 Posts; Posts: 324; Joined: Mon Jul 05, 2010 6:44 amFollowed by: 3 members; Location: London; Thanked: 70 times

by kmittal82 » Thu Jul 29, 2010 8:37 am

lol, it happens my friend. Ive managed to mess up a simple 10/2 calculation in the past before

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