Answer :
For the first place: 3 possibilities
For the second place: 4 possibilities
For the thirth place: 4 possibilities
For thr fourth place: 4 possibilities
So it is possible to get 3 x 4 x 4 x 4 = 192 numbers
For the second place: 4 possibilities
For the thirth place: 4 possibilities
For thr fourth place: 4 possibilities
So it is possible to get 3 x 4 x 4 x 4 = 192 numbers