Find the number that can replace question mark (?) in the series given below.
1, 3, 2, 5, 3, 7, 4, 9, 5, 11, 6, 13 ?
1
15
2
7
3
19
4
8
Find the number that can replace question mark (?) in the series given below.
1, 3, 2, 5, 3, 7, 4, 9, 5, 11, 6, 13 ?