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Look at this series: 80, 10, 70, 15, 60, ... What number should come next? |
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Answer: Option A Explanation: This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next. |
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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