Answer:
51.
Step-by-step explanation:
The rule is to add a number, and the number before.
(Ex: 2, 9, 11. Add 11 and 9. 11 + 8 = 20, therefore 2, 9, 11, 20.)
To find out what is the next term, we add 31 and 20.
31 + 20 = 51.
Therefore, your next term in the pattern is 51.
Hope this helps.
