从1-6中选一偶二奇,组成没重复数字的3位数,有多少个

题目

从1-6中选一偶二奇,组成没重复数字的3位数,有多少个

答案

123,132.213,231,312,321,
125,152,215,251,512,521
143,134,314,341,413,431
145,154,415,451,541,514
163,136,316,361,613,631
165,156,516,561,651,615
235,253,523,532,325,352
435,453,345,354,534,543,
635,653356,365,536,563
共计 54个