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February 20th, 2012, 08:29 AM   #1
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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)
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February 20th, 2012, 11:09 AM   #2
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Re: Permutations

Hello, koolkidx45!

Quote:
How many three-letter arrangements are there of the letters taken from the word SILLY?

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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