Mathematics, 11.11.2020 02:20, Shabat

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? A 3
B 4
C 5
D 6
E 8

Answers: 3

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A number is called flippy if its digits alternate between two distinct digits. For example, 2020 and...