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08-05-2018
Mathematics

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The english alphabet contains 21 consonants and five vowels. how many strings of six letters, each of which is drawn from the english alphabet, contain (a) exactly one vowel?

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08-05-2018

Number of strings = [tex]21^5(5)[/tex] = 21 x 21 x 21 x 21 x 21 x 5 = 20 420 505

Answer: 20 420 505

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