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01-02-2021
Mathematics

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The alphabet of the Bum - Bum tribe consists of 4 letters. A word in its language is any sequence of 4 letters, with at least 2 letters being the same. How many words are there in the language of the Bum - Bum tribe?

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emely113 emely113

02-02-2021

the answer is 4 words if not 6

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