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there is no mode if no value is repeated
For the specific case of whole numbers, you can consider multiplication to be repeated addition; and division to be repeated subtraction (see how often you can subtract something).
It depends on how long would be the resulting string of character and if a character can be repeated or not 1) suppose a string of n characters and characters can be repeated then for the first character one can choose 1 out of 26, the same for the second and so on then there are 26n solutions 2) suppose a string of n characters and none is repeated This string would be less than 27 character long then n<27 for the first character one can choose 1 out of 26 for the second character one can choose 1 out of 25 (25 possible characters are left once the first is chosen) for the third character one can choose 1 out of 24 (24 possible characters are left once the first and the second are chosen) and so on so there are 26x25x24x....x(26-n+1) solutions
The 2009 calendar repeated in 2015. As of 2018, it will next repeat in 2026.
It contains 7 distinct pitches, plus the tonic is often repeated at the octave.