| 1)
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9, 18, 21, 25, 20, ? |
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| 2)
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25, 25, 22, 22, 19, 19, ? |
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| 3)
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?, 14, 12, ?, 13, 16, 14, 17, 15 |
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Find out the first and fourth number of the series. |
| 4)
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2, 6, 18, 54, ?, 486, 1458, 4374 |
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| 5)
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4, 10, 8, 14, 12, 18, ? |
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| 6)
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96, 112, 128, 144, 160, 176, ?, 208 |
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| 7)
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7, 16, 9, 15, 11, 14, ? |
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| 8)
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40, 42, ?, 44, 38, 46, 37 |
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| 9)
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13, 11, 14, 12, 15, 13, ? |
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| 10)
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8, 9, 11, 14, ?, 23, 29, 37, 45 |
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