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Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words begin with AAB in some

Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words begin with AAB in some order? Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words have exactly one vowel? Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words begin with A or end with B? Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words begin with A or B?Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words begin with R and end with T?Suppose that a word is any string of seven letters of the alphabet, with repeated letters allowed. How many words are there?

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