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Question
What number should come next?
9 12 11 14 13 16 15
Options:
A .  14 13
B .  18 21
C .  14 17
D .  12 13
E .  18 17
Answer: Option E


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.


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