Question

how many 4 digit numbers can be formed using the digits 1 to 9 if repetitions are not allowed
​

Answer 1

Answer:

1234

1235

1236

1237

1238

1239

1230

1023

1024

1025

1026

1027

1028

1029

1032

1034

1035

1036

1037

1038

1039

1042

1043

1044

Many numbers can be made

Answer 2

Answer:

there are so many

1234,1235,1236,1237,1238,1239,1324,1325,1326,1327,1328,1329,1432,1435,1436,1446,15

436,1437,1438,1439,1524,1534,1568,4256,7523,4569,8523,4568,7214,8574,3698,4523,7291,1469,8327