What will be the rule?

Step-by-step explanation:
it's rule is multiplying the in by 3
2 *3 = 6
4 * 3 = 12
7 * 3 = 21
9 * 3 = 27
Answer:
times 3
Step-by-step explanation:
ok so this is how I do it, I recommend it!
Look out the out number in the first number: 6
Ask yourself how to get from 6 to 2???......divided by 3 ofc!
Ok so then we see 4 and we multiply by 3=12
21 divided by 3 is 7! Rule right again!
27 divided by 3 is 9! Yay we did it!
Hope this helps :>