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  • 20-10-2017
  • Mathematics
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How many words of length over alphabet s contain exactly two distinct letters?

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  • 20-10-2017

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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