Answer:
34
Step-by-step explanation:
1+4=5 2+5=12 3+6=21 5+8= ??
It is noticed that the previous solution is added to the unknowns and the cycle continues.
The previous solution is 5 which is added to 2 and 5 to give 12
5+2+5=12
12 is then added to the next set of unknowns 3+6 to give 21
12+3+6=21
21 is then added to the 5+8 to give 34
21+5+8= 34
