How many numbers are there between 0000 and 9999?
You may notice that card from a certain institution all have the same first four number. how many different credit card numbers can this institution create.
The four digits can be used to produce infinitely many different numbers if repetition is permitted. Without repetition, there are 24 possible numbers. A lot more can be produced if the numbers are combined using binary oprations, fore example, 19 * 8/4 = 19*2 = 38.
If the digits are all different then 18. Otherwise, 192.
3*3*2*1 = 18 of them.
any 4 from 7 is 35, in any order is 35 x 24 ie 840
With base one million, you can create one nonillion different numbers; using the traditional decimal (base ten) system, you can form 100 thousand different numbers.
How many license plates can be made using either two uppercase English letters followed by four digits or two digits followed by four uppercase English letters?
There are 360 of them.
Twelve of them.
There are four of them: 739, 793, 937, and 973 .
There are 12 such numbers.
16, in four sets of four. Plus expiry dates, and security numbers at the back.
four numbers, four sides get that?
It is possible to create infinitely many numbers, of infinitely many different lengths, using the digits of the given number. Using each of the digits, and only once, there are 5! = 120 different permutations.
total 6 they are 3412,4312,1324,3124,1432,4132
11,238,513 of them.