How many 3-letter strings that have exactly 2 letters the same can be formed using the English Alphabet?

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- Aug 9th 2010, 12:06 PMkensingtonHow many? Using the Alphabet - Please help
How many 3-letter strings that have exactly 2 letters the same can be formed using the English Alphabet?

- Aug 9th 2010, 12:27 PMPlato
Please tell what you think the answer should be.

That is show us some effort. - Aug 9th 2010, 12:37 PMkensington
- Aug 9th 2010, 12:42 PMPlato