Answer:
34 , 20, 35
Explanation:
31, 5, 32, 10, 33, 15,
This is really two sequences
Look at terms 1,3,5
31, 32,33
We are adding 1 each time
Then look at terms 2,4,6
5,10,15
We add 5 each time
It goes add 1 to the odd term, then add 5 to the even term, then add 1 to the odd term,......
Add 1 to the odd term
33 +1 = 34
Add 5 to the even term
Then 15 +5 = 20
Then add 1 to the odd term
34 +1 = 35