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8 11 21 15 18 21 22 choose which pair of...

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
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8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?

Answer & Solution
Correct Answer: Option B
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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1 Comment
Nancy Hernandez
Nancy Hernandez 6 years ago
1+4=5
2+5=12
3+6=21
8+11=
answer should be 40 right
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