Q: Next number in sequence 40 42 21 24 8 12 13?

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20

12

13

The nest number in the sequence is 18. Note that the difference between each number and the next number in the sequence follows the simple sequence of 1,2,3,4. Obviously the next in the sequence of increases is 5, so 13+5=18.

11

11

15

11.

The next number in the sequence 5-7-13-31 is 69.

17?

15

The next number in the sequence is 27.

The next number in the sequence is 27.

The sequence indicates that one number is added to the previous number to find the value of the next number. Example 1 (+0) - 1 (+1) - 2 (+1) - 3 (+2) - 5 (+3) - 8 (+5) - 13. The next number in the sequence would be 21 (13 + 8).

21

It is 129.

10,20,30,20

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

22

The sequence is decreasing by a factor of 5 each time, so the next number would be -2.

Every next number is increased by 5. The next number in the sequence is 23.

The next number in the sequence would be 23. The sequence consists of prime numbers.

The next number in the sequence is 18. It's +1, +2, +3, +4, ....

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

This sequence is created by alternating differences. The difference pattern is 4, 3, 5, 2, and 6. The next difference is 1, so the next number is 13.Ê

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