10,000
you take the four digits and multiply 4 by 4 you get 16 digits
45
there are 4
It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.
120 if numbers can start with 0, otherwise, 96.
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
10,000
you take the four digits and multiply 4 by 4 you get 16 digits
94
If the digits are all different then 18. Otherwise, 192.
45
500
there are 4
It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.
I assume you mean how many 4-digit numbers can be made from a set such as {A,A, B, C} where A, B and C are single digits. There are 12 such numbers.
1,2,3,4 1+2+3+4=10 4 times 3 times 2 times 1 =24 24 counting numbers