10,000
18 of them.
you take the four digits and multiply 4 by 4 you get 16 digits
The four-digit numbers that can be formed using the digits 6, 7, 8, and 9, without repetition, are all the permutations of these four digits. There are 24 possible combinations, including numbers like 6789, 6798, 6879, and so on. Essentially, any arrangement of these four digits constitutes a valid four-digit number.
45
It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
1234, 2637, 7777, 2727 are examples of a four digit number. So any random four numbers are four digits.
18 of them.
5*5*4*4 = 400
you take the four digits and multiply 4 by 4 you get 16 digits
45
If the last two digits of a number are divisible by four, the whole number is divisible by four.
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.
In representing large numbers, English texts use commas (or spaces) to separate each group of three digits. This is almost always done for numbers of six or more digits, and optionally for five (or even four) digits. This makes it easier to read the number without having to count how many place holders there are in the number as a whole.