数字只有1和2 5位数字一共有多少种组合 大神请把组合排列给我 谢谢
推荐回答(5个)
6种!如下
125
152
512
521
215
251
希望我的回答能被你采纳
11112 11121 11211 12111 21111
22221 22212 22122 21222 12222
11122 21112 12112 11212 21121 12121 11221
21211 12211 22111
22211 12221 21221 22121 12212 21212 22112
12122 21122 11222
30种
11111 11112 11121 11122 11211 11212 11221 11222 12111 12112 12121 12122 12211 12212 12221 12222 21111 21112 21121 21122 21211 21212 21221 21222 22111 22112 22121 22122 22211 22212 22221 22222
每个位数只有两个选择,有五个位数就是5个2相乘, 再减去全是2和全是5 的 32-2=30
11111
11112
11121
11211
12111
21111
22111
12211
11221
11122
21112
12112
11212
21121
12121
11222
12221
22211
22112
21212
21221
21122
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