00:01
In this problem, we want to list the first 20 counting numbers in base 5.
00:03
We are given a hint that the digits used are 0, 1, 2, 3, and 4 only.
00:08
Now in counting numbers, the first counting number must be 1.
00:14
So for the 1 -digit counting numbers in base 5, we have 1, 2, 3, and 4.
00:21
And now for the 2 -digit counting numbers, we have to carry out a 1 each time for 0, 1, 2, 3, and 4.
00:30
So we have 10, 11, 12, 13, and then 14.
00:41
And since we need the first 20 counting numbers, we continue...