1. Look at this series: 83, 73, 93, 63, __, 93, 43, ... What number should fill the blank?
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By: guest on 02 Jun 2017 01.29 am
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.