Natural numbers are whole numbers that are greater than zero and represent the counting numbers. Significant three-digit natural numbers are those which have three digits and are distinct from each other. In this article, we will discuss how many distinct three-digit natural numbers there are and the methods to count them.

## Significant 3-Digit Natural Numbers

Significant three-digit natural numbers are those which have three digits and are distinct from each other. They start from 100 and end at 999. Since each digit can have 10 possible values, including 0, there are 1000 possible combinations of three digits.

## Counting the Distinct Numbers

The number of distinct three-digit natural numbers can be calculated by subtracting the number of numbers that have repeating digits. For example, the numbers 111 and 222 have repeating digits, so they do not count as distinct numbers.

The number of distinct three-digit natural numbers can also be calculated by the formula: N = (9 * 9 * 8) + 1, where N is the number of distinct three-digit natural numbers. This formula takes into account the fact that the first digit cannot be 0 and that the other two digits cannot be the same.

The number of distinct three-digit natural numbers is 728.

In conclusion, significant three-digit natural numbers are those which have three digits and are distinct from each other. There are 728 distinct three-digit natural numbers, which can be calculated by subtracting the number of numbers that have repeating digits or by using the formula N = (9 * 9 * 8) + 1.