Alternating sequence
What comes next
Try an alternating number sequence and learn why repeating operations matter.
Quick answer
Answer: 29
The rule alternates between plus 3 and times 2: 2 plus 3 is 5, 5 times 2 is 10, 10 plus 3 is 13, 13 times 2 is 26, so the next step is 26 plus 3.
How to use it
1
Compare each neighboring pair.
2
Notice plus 3, then times 2.
3
Repeat the operation pattern.
4
Apply plus 3 to 26.
What this trains
Pattern recognition
Mental arithmetic
Rule switching
Working memory
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