20 10 22 9 24 8 26............
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7
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5
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21
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28
Reveal answer
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A
Correct answer
Explanation
This sequence has two interleaved patterns: odd positions increase by 2 (20, 22, 24, 26) and even positions decrease by 1 (10, 9, 8). The seventh position (odd) continues 24 + 2 = 26. The eighth position (even) continues 8 - 1 = 7.
AI explanation
This is two interleaved sequences: one increasing by 2 each time (20, 22, 24, 26...) and one decreasing by 1 each time (10, 9, 8...). Reading the terms alternately, the sequence after 26 continues the decreasing sub-sequence, so the next number after 8 is 7.