1-1-2-3-5-8-13 what number should come next in the series?
A
15
B
21
C
26
D
31
Correct Answer: 21
1 + 1 = 2 1 + 2 = 3 2 + 3 = 5 3 + 5 = 8 5 + 8 = 13 8 + 13 = 21 So, the next number in the series should be 21.