No. Numbers are like words, and digits are like letters. A single numeric character is a digit. A single digit or character stands for a number of that value, just as you can have a one-letter word.
There are only ten digits in all: 0 1 2 3 4 5 6 7 8 9. They can be arranged in any combination and quantity, and the result is a number--a grouping of symbols that represents a value. 2, 79, 8407, and 91827365149307 are all numbers, and each of them is made up of digits. Only the first of those is both a number and a digit.
u cant
This cannot be answered. This will have to be written to where it can be understood.
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.
There are 900 of them.
If I understand the question correctly, the digits 1, 2, 3, 4 and 5 appear the same number of times.
The same thing its just digits
Answer: There are six. Answer: There is no such thing as "significant numbers". I assume you mean "significant digits". All digits are significant in this case - a zero (or more than one zero) between other digits is always significant.
987654
u cant
This cannot be answered. This will have to be written to where it can be understood.
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.
They are both 4554454 with the same digits in the same order and position so they are the same number.
u cant
It is 987654321.
There are 900 of them.
2
Isn't that exactly the same thing as counting from 1000 to 9999 ?It's 9999 numbers, minus the first 999 (they have less than 4 digits), which leaves 9,000 of them.