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
10,000
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
The digits product of two digit has number four
94
45
If the digits are all different then 18. Otherwise, 192.
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.
1 is one.
there are 4
500