Consider the following sequence: 21, 9, 21, 11, 21, 13, 21,... What should be the next number?
A. 14
B. 15
C. 21
D. 23
Answer:C
Consider the following sequence: 21, 9, 21, 11, 21, 13, 21,... What should be the next number?
A. 14 B. 15 C. 21 D. 23
Explanation: The random number 21 is interpolated into an otherwise basic addition series that climbs by 2 starting with the number 9 in this alternate repeat series.