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February 20th, 2012, 09:29 AM  #1 
Newbie Joined: Feb 2012 Posts: 5 Thanks: 0  Permutations
How many three letter arrangements are there of the letters taken from the word SILLY? (Hint: Consider cases with and without two L's)

February 20th, 2012, 12:09 PM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Permutations Hello, koolkidx45! Quote:
There are 3 cases to consider: No L's [color=beige]. . [/color]We have: [color=beige]. . [/color] One L [color=beige]. . [/color]We have: [color=beige]. . [/color] [color=beige]. . [/color] Two L's [color=beige]. . [/color]We have [color=beige]. . [/color]There are [color=beige]. . [/color]  

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