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Mathematics, 27.01.2020 03:31 dontcareanyonemo
How many five-digit numbers are there for which each digit is either equal to both adjacent ones, or differs from its neighbors exactly by 1 (from one smaller by 1, and from the other larger by 1) and which contain the digit 5?
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How many five-digit numbers are there for which each digit is either equal to both adjacent ones, or...
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