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A code is made from a sequence of 4 letters. How many

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Manager
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A code is made from a sequence of 4 letters. How many [#permalink]

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New post 10 Oct 2006, 00:00
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A code is made from a sequence of 4 letters.

How many different codes could be made using the letters from the word area?
Director
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New post 10 Oct 2006, 00:34
12?

recently i started using the new approach to these kind of problems... trying to get used to it....

AreA....

4!/2!=12

The key here is to see how many same letters the word has....

For example for word "SmIlIeS" you can have: 7!/(2!*2!)=1260 different codes....
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New post 10 Oct 2006, 12:38
A code is made from a sequence of 4 letters.

How many different codes could be made using the letters from the word area?

Not that combos and perms are my strengths but is this really a combo? I reckon it is a permutation problem

answer is 4! = 24?
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New post 10 Oct 2006, 14:42
it's 12, total outcome is 4! = 24, but need to account for repeats because of AA, so 24/2 = 12
  [#permalink] 10 Oct 2006, 14:42
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A code is made from a sequence of 4 letters. How many

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