Q34
21, 9, 21, 11, 21, 13, 21, ... What number should come next?
A.
14
B.
15
AnswerC.
21
D.
23
Answer: Option B
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.