SOLUTION: 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 reaso
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-> SOLUTION: 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 reaso
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Question 1117825: The inhabitants of the island of Jumble use the standard Kobish alphabet ( letters, A through T). Each word in their language is letters or less, and for some reason, they insist that all words contain the letter A at least once. How many words are possible? Answer by ikleyn(52781) (Show Source):
1. The number of all 4-letter words written using the alphabet of 20 symbols (from A to T) is .
2. The number of all 4-letter words written using the alphabet of 19 symbols (from B to T) is .
3. The difference - represents exactly the number of all words of the inhabitants of the island of Jumble.
- = 29679.
