Whats the next number

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Section 1

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

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