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Amber S.

asked • 04/11/17

up and down natural number

in an up-and-down natural number, the digits increase to a maximum digit and then decrease. This maximum is not the first or last digit. (Example: 256850 is an up-and-down number, but 255876 is not.) How many different 4-digit up and down numbers have a maximum digit of 6?

2 Answers By Expert Tutors

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David W. answered • 04/12/17

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