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The English alphabet contains 21 consonants and five vowels. How many strings of six lowercase letters of the English alphabet containa) exactly one vowel?b) exactly two vowels?c) at least one vowel?d) at least two vowels?
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We are looking for strings of six lowercase letters of the English alphabet that contain a certain number of vowels. Show more…
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How many strings of six lowercase letters from the English alphabet contain a) the letter $a$ ? b) the letters $a$ and $b ?$ c) the letters $a$ and $b$ in consecutive positions with $a$ pre- ceding $b,$ with all the letters distinct? d) the letters $a$ and $b,$ where $a$ is somewhere to the left of $b$ in the string, with all the letters distinct?
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