16. | 90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3 |
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17. | 5, 6, 9, 15, ?, 40 |
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18. | 120, 99, 80, 63, 48, ? |
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19. | 4, 10, ?, 82, 244, 730 |
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20. | 1, 1, 2, 6, 24, ?, 720 |
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