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Mathematics, 13.02.2021 20:00 wananikwecurley99

In an up-and-down counting number, the digits increase to a maximum digit and then decrease. This maximum is not the first or last digit. (Example:
2S68S0 is an up-and-down number, but 25587 6 is not.) How many different
4-digit up-and-down numbers have a maximum digit of 6?

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In an up-and-down counting number, the digits increase to a maximum digit and then decrease. This m...

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