自行車數字鎖的組合

密碼鎖1.2.3.4.5.6密碼為四個數字(如:1357)這種密碼鎖一共有幾組變化!?可重覆!請數學高手幫解答吧!! PS:能否將組合數字給我

(如:1234.1235.1236........)
6*6*6*6=1296種...1111.1112.1113.1114.1115.1116.1121.1122.1123.1124.1125.1126.1131.1132.1133.1134.1135.1136.1141.1142.1143.1144.1145.1146.1151.1152.1153.1154.1155.1156.1161.1162.1163.1164.1165.1166.1212.1213.1214.1215.1216.1221.1222.1223.1224.1225.1226.1231.1232.1233.1234.1235.1236....還真要1296種阿?!!老資不幹了