What is the rule for this sequence?

Question

72 , 63 , 54 , 45 , 36



Each number in the sequence is 10 less than the previous number.
Each number in the sequence is 9 less than the previous number.
The sequence decreases by multiples of 9. First by 9, then 18, then 27, then 36.
The sequence decreases by multiples of 10. First by 10, then 20, then 30, then 40.

Answer 1

I THINK ITS
Each number in the sequence is 9 less than the previous number.