8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?
A. 25, 18
B. 25, 21
C. 25, 29
D. 24, 21
E. 22, 26
Answer: Option B
Solution(By Examveda Team)
This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.Join The Discussion
Comments ( 1 )
Related Questions on Number Series Completion
1+4=5
2+5=12
3+6=21
8+11=
answer should be 40 right