Mathematics, 24.02.2020 21:19 Jasten

The English alphabet contains 21 consonants and five vowels. How many strings of six lowercase letters of the English alphabet contain a) exactly one vowel? b) exactly two vowels? c) at least one vowel? d) at least two vowels?

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The English alphabet contains 21 consonants and five vowels. How many strings of six lowercase lette...