Discussion :: Number Series
- 8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?
Answer : Option B
Explanation :
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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