Look at this series: 4, 7, 25, 10, __, 20, 16, 19, ... What number should fill the blank?
Options
A. 13
B. 15
C. 20
D. 28
Correct Answer
13
Explanation
Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.
Number Series problems
Search Results
1. Look at this series: J14, L16, __, P20, R22, ... What number should fill the blank?
This is a simple subtraction series in which a random number, 93, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.
5. Look at this series: (1/9), (1/3), 1, ____ , 9, ... What number should fill the blank?