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Q: What is the next number is the sequence 6, 9, 13, 20, 31?

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20

The pattern is plus 7. So the next number used to be 1.

12

next in the sequence: 10,20,30,20

20

22

The next number in the sequence will be 56.

10

10,20,30,20

There really is no way of telling, but my guess is 22.

25 is the next number that appears in that sequence.

500

20

10 is one possibility.

500

170

20

10

20

20

80

It's, 7n+6

From the pattern (n + 4, n + 2, n + ?) I would say the next following number is 20 (n + 1).

20

The next number in the sequence is 6. The numbers represent the scores travelling around a regular dartboard, clockwise from the top.