10 Digits (0 to 9)
In the base-10 system, the 4-digit whole numbers are every number from 1,000 to 9,999. That's 9,000 numbers. If decimals are included, there are a lot more. For example, from .0001 to .9999 alone, there are over 9,000 more.
The place value of each digit is b times the place value of the digit to its right where b is the base for the system: whether that is binary, octal, decimal, duodecimal, hexadecimal, sexagesimal or some other value.
One fewer than the base for the number system.
If you mean a number system analogous (similar) to our decimal system, the base for such a number system can be any integer, 2 or greater. In other words, the base can be 2, 3, 4, 5, etc. You need as many different digits as the size of the base (decimal is in base 10, so you need 10 different digits).
A three digit number cannot be divisible by a 5 digit number - in any base.
14
9,000,000
625. Here's how:There are five odd digits {1,3,5,7,9} so our numbers will be made using only these digits. This is the same number of possibilities as if you had a base 5 number system where the allowed digits are {0,1,2,3,4}. For a 1 digit base-5, there are 5 possibilities, for a two digit base-5 there are 5² = 25 possibilities, so for a 4-digit, there are 5^4 = 625possible. This is the same number you will have with only using odd digits.
10 Digits (0 to 9)
In the decimal system, 10 times. In another system, where the base is x, it would be x times.
In the base-10 system, the 4-digit whole numbers are every number from 1,000 to 9,999. That's 9,000 numbers. If decimals are included, there are a lot more. For example, from .0001 to .9999 alone, there are over 9,000 more.
The place value of each digit is b times the place value of the digit to its right where b is the base for the system: whether that is binary, octal, decimal, duodecimal, hexadecimal, sexagesimal or some other value.
One fewer than the base for the number system.
A number is made up from digits in the numeral system. We often use the decimal system in which we use 10 digits, In writing the any number, many digits are used, even repitation of digits. when we write any number using the digits, the last digit ( from right side ) in that number is called unit digit. for example in the number 9814868980, here 0 is called unit digit.
In base ten, there are 9000 four digit number, the numbers are from 1000 to 9999. If you allow leading zeros, then there are 10000 numbers. [0000 - 9999]
If you mean a number system analogous (similar) to our decimal system, the base for such a number system can be any integer, 2 or greater. In other words, the base can be 2, 3, 4, 5, etc. You need as many different digits as the size of the base (decimal is in base 10, so you need 10 different digits).