英语翻译30.What is the total number of different 5-digit numbers
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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)
包含2,3,4,7,9五个数,且其中奇数不相邻的五位数共有多少个?(x2x4x和x4x2x)x代表3,7,9 所以 共12种
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