Find the missing term: 2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11, ?

Explanation:-

The given sequence is a combination of three series:
I. 1st, 4th, 7th, 10th, 13th terms i.e., 2, 4, 6, 8, ?
II. 2nd, 5th, 8th, 11th terms i.e., 1, 4, 7, 10
III. 3rd, 6th, 9th, 12th terms i.e., 2, 5, 8, 11
Clearly, I. consists of consecutive even numbers. So, the missing term is 10.