Find the number that can replace the question mark (?) in the series given below: 1, 3, 2, 5, 3, 7, 4, 9, 5, 11, 6, 13, ?

The next term is 7.

Odd positions give 1, 2, 3, 4, 5, 6, ... rising by 1.

Even positions give 3, 5, 7, 9, 11, 13, rising by 2.

The asked term sits at an odd position after 6.

So it continues the first count: 7.