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

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- August 9th 2010, 11:06 AMkensingtonHow 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?

- August 9th 2010, 11:27 AMPlato
Please tell what you think the answer should be.

That is show us some effort. - August 9th 2010, 11:37 AMkensington
- August 9th 2010, 11:42 AMPlato