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4. How many sequences of length 6 formed from the 26 letters without repetition are there...

4. How many sequences of length 6 formed from the 26 letters without repetition are there where the vowels (a,e,i,o,u) may only appear in the first or/and last positions (possibly neither)?

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Answer #1

5 vowels, 21 consonants ODODOO (-) No vowel, No of asays: P(21,6) CMI I vowel, Popo DOO OOOOOM No of ways = 2x P(5,1 « P(21,5

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