probability

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kalyand022: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Mon Nov 17, 2008 4:40 am

by kalyand022 » Sat Nov 29, 2008 8:36 am

how many 3 letter words can be created from alphabets abcd

Source: Beat The GMAT — Problem Solving | Sat Nov 29, 2008 8:36 am

sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

by sudhir3127 » Sat Nov 29, 2008 9:26 am

kalyand022 wrote:how many 3 letter words can be created from alphabets abcd

24.

4.3.2 or 4*3!

muzali: Senior | Next Rank: 100 Posts; Posts: 95; Joined: Fri Sep 28, 2007 10:16 am; Thanked: 6 times; GMAT Score:710

by muzali » Sat Nov 29, 2008 9:44 am

kalyand022 wrote:how many 3 letter words can be created from alphabets abcd

1. No restrictions on letters being repeated: 4*4*4=4^3=64
2. No letter can be repeated=4*3*2=24

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