Question

How to find missing number if 3,6,6,12,11,20,18,?,?

Answer 1

Alternative addition of 3 and subtraction of 0, 1,2,3.....

That will be in the following order

3

3+3=6

6-0=6

6+6=12

12-1=11

11+9=20

20-2=18

18+12=30

30-3=27

So, 3,6,6,12,11,20,18,30,27