Look at this series: 83, 73, 93, 63, __, 93, 43, ... What number should fill the blank?
Options:
A . 53
B . 93
C . 33
D . 73
Answer: Option A
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.
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