21, 9, 21, 11, 21, 13, 21, … What number should come next?
Table of Contents
A. 14
B. 15
C. 21
D. 23
Answer & Solution
Answer: Option B
Solution:
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
Also Read:
- 1, 9, 25, 49, ?, 121.
- 4, 7, 12, 19, 28, ?
- 6, 11, 21, 36, 56, ?
- 10, 100, 200, 310, ?
- 8, 28, 116, 584, ?
- 3, 7, 23, 95, ?
- 7, 26, 63, 124, 215, 342, ?
- 165, 195, 255, 285, 345, ?
- 34, 45, 56, 67, ……. What number should come next?
- Find out the wrong number. 150, 450, 750, 1060,1350,1650,1950
