This is a number progression which increases by "2" in the last column when subtracting advancing numbers by the one that precedes it.
Therefore the answer is: 34
7-2 = 5
14-7 = 7
23-14 = 9
34-23 = 11
47-34 = 13
It's just adding 7;9;11;13 step by step And we get 34 as bcoz. 23+11=34
23+11=34,NEXT 34+13=47
Complete the series-
9 5 14 8 3 12 7 2 23 5 2 29 3 9 ??