1. | 6, 13, 28, 59, ? |
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2. | 4, 12, 36, 108, ? |
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3. | 1, 3, 4, 8, 15, 27, ? |
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4. | 3, 12, 27, 48, 75, 108, ? |
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5. | 28, 33, 31, 36, -----, 39? |
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