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31.

The rule is Un = (n5 - 17n4 + 111n3 - 349n2 + 518n - 216)/12 for n = 1, 2, 3, ...

Q: What is the next number in this series 4 6 5 4 2 4?

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

20

it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3

The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36

10

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

20

it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3

4

256 256

10

The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36

10

The next number in the series 2-4-3-9-4 is 16. 2 squared is 4, 3 squared is 9, 4 squared is 16

16

The next number is 4. There is a sequence:Add 3, subtract 2, repeat

The next number is 2.