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Mathematics, 27.03.2021 21:10 Teilen

How many 3-letter sequences can be formed if the second letter must be a vowel (A, E, I, O, or U), and the third letter must be different from the first letter?

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How many 3-letter sequences can be formed if the second letter must be a vowel (A, E, I, O, or U), a...
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