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Mathematics, 17.07.2019 14:30 kasier4600

The inhabitants of the island of jumble use the standard kobish alphabet ($20$ letters, a through t). each word in their language is $4$ letters or less, and for some reason, they insist that all words contain the letter a at least once. how many words are possible?

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The inhabitants of the island of jumble use the standard kobish alphabet ($20$ letters, a through t)...

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