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Q: What is the next number in the series 25 22 21 34 49 78?

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44

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21 - each number in the series increases by the series 1,2,3,4,5.... Whereby 6 and 7 are separated by 1, 7 and 9 are separated by 2, 9 and 12 are separated by 3, 12 and 16 are separated by 4, so the next in the series would be 21 (16 and 21 are separated by 5).

13 18 16 21 19 24 22 27 25 ... . This series consists of adding 5 to the first number and subtracting 2 from the next number, repeating the sequence in that order.

16 21 22 29

The next number in the series 1 2 4 8 10 20 22 is

550

20

39

18

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12

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