How many two digit numbers are there in which the tens digit is greater than the oneβs digit ?
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
ccsndf
-5674
8 of them.
With 123 digits you can make 123 one-digit numbers.
12 numbers
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
8
162
5040
6, as long as they are all different
12,13,14 21,23,24 31,32,34 43,42,41 12 two-digit numbers
There are no three didgit numbers but there are 63 three digit numbers.
24 if you don't repeat any numbers.24
10999
24