Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?

Given data

• Series: 22, 21, 23, 22, 24, 23, ...

Concept/ApproachAlternating pattern: −1, +2, −1, +2, −1, +2, ...

Step-by-Step calculation22 − 1 = 2121 + 2 = 2323 − 1 = 2222 + 2 = 2424 − 1 = 23Next: 23 + 2 = 25

Verification/AlternativeCheck two-step cycle repeats consistently.

Common pitfalls

• Assuming constant difference (+1 or −1) which does not fit all terms.

Final Answer25