A password consists of 8 characters, the first two are identical vowels, the 6th character is '7', and the last character is an even digit less than 8. How many such passwords exist? (Repetition is allowed, characters are alphanumeric)
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The first two characters are identical vowels. There are 5 vowels (A, E, I, O, U), so there are 5 choices for the first two characters. Show more…
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