Question
What number should come next?
8 11 21 15 18 21 22
8 11 21 15 18 21 22
Answer: Option C
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This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.
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