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用1367组成不同四位数 用1-10这10个数可以组成多少组由不同4个数字组成的组数?

2020-10-05知识9

1,2,3,4,5,6,7,8组成没有重复的四位数 2345678四位数最高位不可能为8,7,6最高位是5的时候只有1种可能,即5678最高位是4的时候,后三位为5,6,7,8中任意取3个数按从小到大排,则共有4种可能:4567,4678,4578,4568最高位是3的时候,后三位为4,5,6,7,8中任意取3个数按从小到大排,则共有5*4*3/(3*2)=10种可能:3456,3457,3458,3467,3468,3478,3567,3568,3578,3678最高位是2的时候,后三位后三位为3,4,5,6,7,8中任意取3个数按从小到大排,则共有6*5*4/(3*2)=20种可能:2345,2346,2347,2348,2356,2357,2358,2367,2368,2378,2456,2457,2458,2467,2468,2478,2567,2568,2578,2678共有1+4+10+20=35种排法

用1367组成不同四位数 用1-10这10个数可以组成多少组由不同4个数字组成的组数?

有数字1248可能组成多个不同的四位数、 24个 每个数当千位时都有6个

用1367组成不同四位数 用1-10这10个数可以组成多少组由不同4个数字组成的组数?

用0123四个数字能组成多少个不同的三位数

用1367组成不同四位数 用1-10这10个数可以组成多少组由不同4个数字组成的组数?

12345678任选4位数 不讲顺序 有哪些组合

用1-10这10个数可以组成多少组由不同4个数字组成的组数? 感觉应2113该是0-9来排列如果你非要1-10,可以用5261410210来替换0的位置0123,0124,0125,0126,0127,0128,01290134,0135,0136,0137,0138,01390145,0146,0147,0148,01490156,0157,0158,01590167,0168,01690178,017901890234,0235,0236,0237,0238,02390245,0246,0247,0248,02490256,0257,0258,02590267,0268,02690278,027902890345,0346,0347,0348,03490356,0357,0358,03590367,0368,03690378,037903890456,0457,0458,04590467,0468,04690478,047904890567,0568,05690578,057905890678,067906890789.84组16531234,1235,1236,1237,1238,12391245,1246,1247,1248,12491256,1257,1258,12591267,1268,12691278,127912891345,1346,1347,1348,13491356,1357,1358,13591367,1368,13691378,137913891456,1457,1458,14591467,1468,14691478,147914891567,1568,15691578,157915891678,167916891789.56组2345,2346,2347,2348,23492356,2357,2358,23592367,2368,23692378,237923892456,2457,2458,24592467,2468,24692478,247924892567,2568,25692578,257925892678,267926892789.35组3456,3457,3458,34593467,。

1~9组成一个2位数、一个3位数和一个4位数的和为2007。求答案! 二位数+三位数+四位数为一组,从左到右一共4组一行,随便挑24 386 1597 24 387 1596 24 396 1587 24 397 158624 586 1397 24 587 1396 24 596 1387 24 597 138626 384 1597 26 387 1594 26 394 1587 26 397 158426 584 1397 26 587 1394 26 594 1387 26 597 138427 384 1596 27 386 1594 27 394 1586 27 396 158427 584 1396 27 586 1394 27 594 1386 27 596 138434 275 1698 34 278 1695 34 295 1678 34 298 167534 675 1298 34 678 1295 34 695 1278 34 698 127535 274 1698 35 278 1694 35 294 1678 35 298 167435 674 1298 35 678 1294 35 694 1278 35 698 127438 274 1695 38 275 1694 38 294 1675 38 295 167438 674 1295 38 675 1294 38 694 1275 38 695 127442 367 1598 42 368 1597 42 376 1589 42 379 158642 386 1579 42 389 1576 42 397 1568 42 398 156742 567 1398 42 568 1397 42 576 1389 42 579 138642 586 1379 42 589 1376 42 597 1368 42 598 136743 275 1689 43 279 1685 43 285 1679 43 289 167543 675 1289 43 679 1285 43 685 1279 43 689 127545 273 1689 45 279 1683 45 283 1679 45 289 167345 673 1289 45 679 1283。

用0123四个数字能组成多少个不同的三位数 百位只有3种情况百位确定后十位也只有3种情况同理,个位只有2中选择3x3x2=18种能组成18个不同的三位数

用1-10这10个数可以组成多少组由不同4个数字组成的组数? 感觉应该是0-9来排列如果你非要1-10,可以用10来替换0的位置0123,0124,0125,0126,0127,0128,01290134,0135,0136,0137,0138,01390145,0146,0147,0148,01490156,0157,0158,01590167,0168,01690178,017901890234,0235,0236,0237,0238,02390245,0246,0247,0248,02490256,0257,0258,02590267,0268,02690278,027902890345,0346,0347,0348,03490356,0357,0358,03590367,0368,03690378,037903890456,0457,0458,04590467,0468,04690478,047904890567,0568,05690578,057905890678,067906890789.84组1234,1235,1236,1237,1238,12391245,1246,1247,1248,12491256,1257,1258,12591267,1268,12691278,127912891345,1346,1347,1348,13491356,1357,1358,13591367,1368,13691378,137913891456,1457,1458,14591467,1468,14691478,147914891567,1568,15691578,157915891678,167916891789.56组2345,2346,2347,2348,23492356,2357,2358,23592367,2368,23692378,237923892456,2457,2458,24592467,2468,24692478,247924892567,2568,25692578,257925892678,267926892789.35组3456,3457,3458,34593467,3468,34693478,34793489。

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