英语翻译30.What is the total number of different 5-digit numbers
英语翻译
30.What is the total number of different 5-digit numbers that contain all of the digits 2,3,4,7,and 9 and in which none of the odd digits occur next to each other?
answer:12
翻译并做谢谢（不要用机器）
30.What is the total number of different 5-digit numbers that contain all of the digits 2,3,4,7,and 9 and in which none of the odd digits occur next to each other?
answer:12
翻译并做谢谢（不要用机器）
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