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21 July, 12:12

How many words of length over alphabet s contain exactly two distinct letters?

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  1. 21 July, 13:42
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    The english alphabet contains 2121 consonants and 55 vowels. How many strings of 66 lowercase letters of the English alphabet contain

    a) exactly 1 vowel

    b) exactly 2 vowels

    c) at least one vowel

    d) at least two vowels
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