Assuming no leading zeros (example: exclude the number 0400), then the answer is 20. Here they are:
1003, 1012, 1021, 1030, 1102,
1111, 1120, 1201, 1210, 1300,
2002, 2011, 2020, 2101, 2110,
2200, 3001, 3010, 3100, 4000
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.
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.
there are 4
you take the four digits and multiply 4 by 4 you get 16 digits
You had me until "product." The product of 4 digits can't be prime.
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.
1234, 2637, 7777, 2727 are examples of a four digit number. So any random four numbers are four 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.
500
there are 4
you take the four digits and multiply 4 by 4 you get 16 digits
You had me until "product." The product of 4 digits can't be prime.
The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.
The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.
If the digits can be repeated, then there are (5 x 5 x 5 x 5) = 625 different four-digit numbers.If the digits can't be repeated, then there are (5 x 4 x 3 x 2) = 120 different four-digit numbers.
Thousands would be your 4 digit numbers - 1000-9999.
Four digit numbers span from 1000 to 9999. This totals (9999-1000) +1 = 9000 different four digit numbers