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Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next? |
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Answer: Option B Explanation: 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. |
In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
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