Look carefully for the pattern, and then choose which pair of numbers comes next:
9 12 11 14 13 16 15
A
14 13
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B
18 21
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C
14 17
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D
12 13
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E
18 17
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Solution
The correct option is E 18 17 This is a simple alternating addition and subtraction series. First, 3 is added, then 1 is subtracted, then 3 is added, 1 subtracted, and so on.