A number is called flippy if its digits alternate between two distinct digits. For example, 2020 and 37373 are flippy, but 3883 and 123123 are not. How many five-digit flippy numbers are divisible by 15?
Tagged: AMC 8 free test, AMC 8 daily question
This website, MathAlready, helps students and users to undetstand the formula better.
Please contact us if you have any suggestion.
ma@mathalready.com