如果一个四位数与一个三位数的和是1999,并且四位数和三位数是由7个不同的数字组成的.那么,这样的四位数最多能有多少个?

如果一个四位数与一个三位数的和是1999,并且四位数和三位数是由7个不同的数字组成的.那么,这样的四位数最多能有多少个?

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1023 + 976 = 1999
1024 + 975 = 1999
1025 + 974 = 1999
1026 + 973 = 1999
1032 + 967 = 1999
1034 + 965 = 1999
1035 + 964 = 1999
1037 + 962 = 1999
1042 + 957 = 1999
1043 + 956 = 1999
1046 + 953 = 1999
1047 + 952 = 1999
1052 + 947 = 1999
1053 + 946 = 1999
1056 + 943 = 1999
1057 + 942 = 1999
1062 + 937 = 1999
1064 + 935 = 1999
1065 + 934 = 1999
1067 + 932 = 1999
1073 + 926 = 1999
1074 + 925 = 1999
1075 + 924 = 1999
1076 + 923 = 1999
1203 + 796 = 1999
1204 + 795 = 1999
1205 + 794 = 1999
1206 + 793 = 1999
1230 + 769 = 1999
1234 + 765 = 1999
1235 + 764 = 1999
1239 + 760 = 1999
1240 + 759 = 1999
1243 + 756 = 1999
1246 + 753 = 1999
1249 + 750 = 1999
1250 + 749 = 1999
1253 + 746 = 1999
1256 + 743 = 1999
1259 + 740 = 1999
1260 + 739 = 1999
1264 + 735 = 1999
1265 + 734 = 1999
1269 + 730 = 1999
1293 + 706 = 1999
1294 + 705 = 1999
1295 + 704 = 1999
1296 + 703 = 1999
1302 + 697 = 1999
1304 + 695 = 1999
1305 + 694 = 1999
1307 + 692 = 1999
1320 + 679 = 1999
1324 + 675 = 1999
1325 + 674 = 1999
1329 + 670 = 1999
1340 + 659 = 1999
1342 + 657 = 1999
1347 + 652 = 1999
1349 + 650 = 1999
1350 + 649 = 1999
1352 + 647 = 1999
1357 + 642 = 1999
1359 + 640 = 1999
1370 + 629 = 1999
1374 + 625 = 1999
1375 + 624 = 1999
1379 + 620 = 1999
1392 + 607 = 1999
1394 + 605 = 1999
1395 + 604 = 1999
1397 + 602 = 1999
1402 + 597 = 1999
1403 + 596 = 1999
1406 + 593 = 1999
1407 + 592 = 1999
1420 + 579 = 1999
1423 + 576 = 1999
1426 + 573 = 1999
1429 + 570 = 1999
1430 + 569 = 1999
1432 + 567 = 1999
1437 + 562 = 1999
1439 + 560 = 1999
1460 + 539 = 1999
1462 + 537 = 1999
1467 + 532 = 1999
1469 + 530 = 1999
1470 + 529 = 1999
1473 + 526 = 1999
1476 + 523 = 1999
1479 + 520 = 1999
1492 + 507 = 1999
1493 + 506 = 1999
1496 + 503 = 1999
1497 + 502 = 1999
1502 + 497 = 1999
1503 + 496 = 1999
1506 + 493 = 1999
1507 + 492 = 1999
1520 + 479 = 1999
1523 + 476 = 1999
1526 + 473 = 1999
1529 + 470 = 1999
1530 + 469 = 1999
1532 + 467 = 1999
1537 + 462 = 1999
1539 + 460 = 1999
1560 + 439 = 1999
1562 + 437 = 1999
1567 + 432 = 1999
1569 + 430 = 1999
1570 + 429 = 1999
1573 + 426 = 1999
1576 + 423 = 1999
1579 + 420 = 1999
1592 + 407 = 1999
1593 + 406 = 1999
1596 + 403 = 1999
1597 + 402 = 1999
1602 + 397 = 1999
1604 + 395 = 1999
1605 + 394 = 1999
1607 + 392 = 1999
1620 + 379 = 1999
1624 + 375 = 1999
1625 + 374 = 1999
1629 + 370 = 1999
1640 + 359 = 1999
1642 + 357 = 1999
1647 + 352 = 1999
1649 + 350 = 1999
1650 + 349 = 1999
1652 + 347 = 1999
1657 + 342 = 1999
1659 + 340 = 1999
1670 + 329 = 1999
1674 + 325 = 1999
1675 + 324 = 1999
1679 + 320 = 1999
1692 + 307 = 1999
1694 + 305 = 1999
1695 + 304 = 1999
1697 + 302 = 1999
1703 + 296 = 1999
1704 + 295 = 1999
1705 + 294 = 1999
1706 + 293 = 1999
1730 + 269 = 1999
1734 + 265 = 1999
1735 + 264 = 1999
1739 + 260 = 1999
1740 + 259 = 1999
1743 + 256 = 1999
1746 + 253 = 1999
1749 + 250 = 1999
1750 + 249 = 1999
1753 + 246 = 1999
1756 + 243 = 1999
1759 + 240 = 1999
1760 + 239 = 1999
1764 + 235 = 1999
1765 + 234 = 1999
1769 + 230 = 1999
1793 + 206 = 1999
1794 + 205 = 1999
1795 + 204 = 1999
1796 + 203 = 1999