Then, set up the four-digit PIN on the option below.

然后，设置下面的选项四位数pin。

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How many four-digit positive integers have their product of digits even?

数字之积为偶数的四位正整数共有多少个？

youdao

How many four-digit positive integers have their product of digits even?

数字之积为偶数的四位正整数共有多少个？

youdao