(1)以1開頭的數有121323 131232 123123 123132 132123 132132 123213 132312 132321 123231 等10個數; (2)121323,131232,123123,123132,121323,121332,132123,132132,123213,132312,213123,213132,312123,312132,212313,213213,312312,313212,213231,312321,231213,231312,321213,321312,231231,231321,321231,321321,232131,323121則***30個符合條件的六位數. |