You are supposed to make a claim then prove it using evidence you are already given.
Answer:
The numbers increase by 3
Step-by-step explanation:
The difference between all the numbers in the sequence have a gap of 3
9 and 12 --gap of 3
12 and 15--gap of 3
18 and 21--gap of 3
21 and 24--gap of 3
There are 10,000 possible values the digits 0 and 9 can be arranged as a 4-digit number.
