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The English alphabet contains 21 consonants and five vowels. How many strings of five lowercase letters of the English alphabet contain: a.exactly one vowel? b.exactly

The English alphabet contains 21 consonants and five vowels. How many strings of five lowercase letters of the English alphabet contain:

a.exactly one vowel?

b.exactly two vowels?

c.at least one vowel?

d.are palindromes (read the same forward and backward)?

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