If you follow the difference in these numbers:
2 + 7 = 9
9 - 4 = 5
5 + 8 = 13
13 - 3 = 10
10 + 9 = 19
19 - 2 = 17
You can see that the numbers being subtracted and the numbers being added each follow a pattern:
Addition: 7, 8, 9
Subtraction: 4, 3, 2
The next number in the sequence then would be 27, as 9 + 1 = 10 and 17 + 10 = 27. The next one would be 26, as -2 + 1 = -1, and 27 + -1 = 26, and so on:
2 9 5 13 10 19 17 26 37 37 49 50 63 65 ...
The next number in the sequence is 27.
27. But that continues the sequence, it does not complete it.
27
How are we supposed to answer this without the numbers? 27: 2 (+7=) 9 (-4=) 5 (+8=) 13 (-3=) 10 (+9=) 19 (-2=) 17 (+10=) 27 (-1=) 26
11 13 15 17 19
2 5 9 10 13 17 19
2 9 5 13 10 19 17
that best completes the sequence 2 9 5 13 10 19 17 is 27.
18
The number after 17 is 27. 2+7 = 9 9 - 4 = 5 5 + 8 = 13 13 - 3 = 10 10 + 9 = 19 19 - 2 = 17 17 + 10 = 27
The next number in the sequence is 27.
twenty-seven.
27
27
27
One.
27