bowenstimothy1986 bowenstimothy1986

25-10-2022
Mathematics

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call a positive integer monotonousmonotonous if it is a one-digit number or its digits, when read from left to right, form either a strictly increasing or a strictly decreasing sequence. for example, 33, 2357823578, and 987620987620 are monotonous, but 8888, 74347434, and 2355723557 are not. how many monotonous positive integers are there?

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