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Discrete Math
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OpenStudy (anonymous):
How many strings are there of lowercase letters of the alphabet which have a length of four or less? How many strings of eight English letters are there a) (2 pts) that contain no vowels, if letters can be repeated? b) (2 pts) that contain no vowels, if no letters can be repeated? c) (2 pts) that start with a vowel, if letters can be repeated?
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