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# lets say you have the word M-I-S-S whats a quick way to

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lets say you have the word M-I-S-S whats a quick way to [#permalink]

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02 Apr 2008, 10:55
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lets say you have the word M-I-S-S
whats a quick way to determine the number of combinations of two letters you can create?

Simple combination formula would suggest 4C2, which is 6, but this is not the case since there are two S's, so the actual number of combos is 4:
MI, MS, SS, IS
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Joined: 29 Aug 2007
Posts: 2492
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Re: PS counting [#permalink]

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02 Apr 2008, 13:30
young_gun wrote:
lets say you have the word M-I-S-S
whats a quick way to determine the number of combinations of two letters you can create?

Simple combination formula would suggest 4C2, which is 6, but this is not the case since there are two S's, so the actual number of combos is 4:
MI, MS, SS, IS

total = 4c2 = 6
repetation = 2
so actual = 6 - 2 = 4
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Current Student
Joined: 31 Aug 2007
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Re: PS counting [#permalink]

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02 Apr 2008, 16:09
GMAT TIGER wrote:
young_gun wrote:
lets say you have the word M-I-S-S
whats a quick way to determine the number of combinations of two letters you can create?

Simple combination formula would suggest 4C2, which is 6, but this is not the case since there are two S's, so the actual number of combos is 4:
MI, MS, SS, IS

total = 4c2 = 6
repetation = 2
so actual = 6 - 2 = 4

could you explain this part more:
repetation = 2
so actual = 6 - 2 = 4

What if the word contained more letters? say: ABCDDDEFGHHH?
Then how many unique combinations?
Thanks!
Re: PS counting   [#permalink] 02 Apr 2008, 16:09
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# lets say you have the word M-I-S-S whats a quick way to

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