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: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 ...