关于排列组合现在在学数学必修3概率想了解一些排列组合的知识。比如八张卡片任取4张有多少种排列的方式应该是用排列公式A84=8!/4!=1680如果八个人选4个分成小组是不是A/4!=70种可是我
关于排列组合
现在在学数学必修3概率想了解一些排列组合的知识。比如八张卡片任取4张有多少种排列的方式应该是用排列公式A84=8!/4!=1680
如果八个人选4个分成小组是不是A/4!=70种
可是我列不出来那么多种啊
No.1:1234
No.2:1235
No.3:1236
No.4:1237
No.5:1238
No.6:1245
No.7:1246
No.8:1247
No.9:1248
No.10:1256
No.11:1257
No.12:1258
No.13:1267
No.14:1268
No.15:1278
No.16:1345
No.17:1346
No.18:1347
No.19:1348
No.20:1356
No.21:1357
No.22:1358
No.23:1367
No.24:1368
No.25:1378
No.26:1456
No.27:1457
No.28:1458
No.29:1467
No.30:1468
No.31:1478
No.32:1567
No.33:1568
No.34:1578
No.35:1678
No.36:2345
No.37:2346
No.38:2347
No.39:2348
No.40:2356
No.41:2357
No.42:2358
No.43:2367
No.44:2368
No.45:2378
No.46:2456
No.47:2457
No.48:2458
No.49:2467
No.50:2468
No.51:2478
No.52:2567
No.53:2568
No.54:2578
No.55:2678
No.56:3456
No.57:3457
No.58:3458
No.59:3467
No.60:3468
No.61:3478
No.62:3567
No.63:3568
No.64:3578
No.65:3678
No.66:4567
No.67:4568
No.68:4578
No.69:4678
No.70:5678
分两个小组的话就是
4
C=70种
8