1234, 2637, 7777, 2727 are examples of a four digit number. So any random four numbers are four digits.
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.
you take the four digits and multiply 4 by 4 you get 16 digits
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
10,000
45
It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.
Any pair of digits (not including 0), can be used to generate 14 four-digit numbers. If one of the digits is 0, only seven will start with a non-zero digit.
94
If the digits are all different then 18. Otherwise, 192.
1,2,3,4 1+2+3+4=10 4 times 3 times 2 times 1 =24 24 counting numbers
If you're asking for 4 digit numbers where all four digits are odd, then the lowest number possible is 1111, and the highest is 9999. You only have 5 digits to work with. The answer is: 54 - 53 = 625 - 125 = 500.Subtract the 5 cubed for the numbers less than 1111, which are not four digits.
The first four numbers in pi are 3.141. Backwards, the first four numbers are 141.3. Pi has been calculated to over a million digits.