What is every combination of a 4-digit number using the numbers 1234567890?

Answer 1

There are 210 of them and they are:0123, 0124, 0125, 0126, 0127, 0128, 0129, 0134, 0135, 0136,

0137, 0138, 0139, 0145, 0146, 0147, 0148, 0149, 0156, 0157,

0158, 0159, 0167, 0168, 0169, 0178, 0179, 0189, 0234, 0235,

0236, 0237, 0238, 0239, 0245, 0246, 0247, 0248, 0249, 0256,

0257, 0258, 0259, 0267, 0268, 0269, 0278, 0279, 0289, 0345,

0346. 0347, 0348, 0349, 0356, 0357, 0358, 0359, 0367 ,0368,

0369, 0378, 0379, 0389, 0456, 0457, 0458, 0459, 0467, 0468,

0469, 0478, 0479, 0489, 0567, 0568, 0569, 0578, 0579, 0589,

0678, 0679, 0689, 0789, 1234, 1235, 1236, 1237, 1238, 1239,

1245, 1246, 1247, 1248, 1249, 1256, 1257, 1258, 1259, 1267,

1268, 1269, 1278, 1279, 1289, 1345, 1346, 1347, 1348, 1349,

1356, 1357, 1358, 1359, 1367, 1368, 1369, 1378, 1379, 1389,

1456, 1457, 1458, 1459, 1467, 1468, 1469, 1478, 1479, 1489,

1567, 1568, 1569, 1578, 1579, 1589, 1678, 1679, 1689, 1789,

2345, 2346, 2347, 2348, 2349, 2356, 2357, 2358, 2359, 2367,

2368, 2369, 2378, 2379, 2389, 2456, 2457, 2458, 2459, 2467,

2468, 2469, 2478, 2479, 2489, 2567, 2568, 2569, 2578, 2579,

2589, 2678, 2679, 2689, 2789, 3456, 3457, 3458, 3459, 3467,

3468, 3469, 3478, 3479, 3489, 3567, 3568, 3569, 3578, 3579,

3589, 3678, 3679, 3689, 3789, 4567, 4568, 4569, 4578, 4579,

4589, 4678, 4679, 4689, 4789, 5678 ,5679, 5689, 5789 and 6789.

Answer 2

what are the every 4-digit numbers that can be formed using 1234567890

Answer 3

6574