How many possible combinations of 5 letters?

How many possible combinations of 5 letters?
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answer:there are 11,881,376 five-letter combinations using a 26 letter alphabet (26*26*26*26*26) add one more letter? 308,915,776 combinations. this is assuming you can repeat letters, so “aaaaa” is acceptable, and also assuming no difference between uppercase and lowercase letter, so that “abCde” is the same as “abcde”.
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