Question

que numero sigue en la serie 9. 15. 23. 34. 49

Answer 1

9+6 = 15
15+8 = 23
23+11=34
34+15 = 49
49+20 = 69

Sigue el 69

Answer 2

9-15-23-34-49-69
6--8--11--15--20
2---3--4---5
1---1---1