How do I find the rule when the number is descending 9,6,3,0

What is the difference between each pair of numbers?

All next number is previous number-3

9-3=6
6-3=3
3-3=0
0-3=-3

To find the rule for a series of numbers that are descending, we need to identify the pattern or relationship between the numbers. In the case of the given series 9, 6, 3, 0, we can observe that each number is decreasing by 3.

To explain how to find the rule in this specific case:
1. Identify the first number in the series: The first number is 9.
2. Determine the common difference: Calculate the difference between any two consecutive numbers in the series. In this case, the difference is 9 - 6 = 3, 6 - 3 = 3, and 3 - 0 = 3. We can see that the common difference is 3.
3. Write the rule: The rule for this series is that each number is obtained by subtracting 3 from the previous number.

Therefore, the rule for the given series is "each number is obtained by subtracting 3 from the previous number."