选择题
2020 AMC 8 Problem 19: Flippy Numbers
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?
2020 AMC 8 第 19 题:翻转数字
如果一个数字的数字在两个不同的数字之间交替,则该数字被称为“翻转”。例如,2020 和 37373 是翻转的,但 3883 和 123123 不是。有多少个五位数字可以被 15 整除
A.
3
B.
4
C.
5
D.
6
E.
8