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Question
What number should come next?
13 29 15 26 17 23 19
Options:
A .  21 23
B .  20 17
C .  25 27
D .  22 20
E .  20 21
Answer: Option E

Here, there are two alternating patterns, with every other number following a different pattern. The first pattern begins with 13 and adds 2 to each number to arrive at the next; the alternating pattern begins with 29 and subtracts 3 each time.



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