SOLUTION: The number which best completes the sequence below is: 2 9 5 13 10 19 17

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Question 900318: The number which best completes the sequence below is:
2 9 5 13 10 19 17
Found 2 solutions by JulietG, richwmiller:
Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
27
Maybe....

2 +7 = 9
9 -4 = 5
5 +8 = 13
13 -3 = 10
10 +9 = 19
19 -2 = 17
17 +10 = 27
27 -1 = 26
26 +11 =37
37 -0 = 37
Positives go up, negatives go down. Every other pair. I couldn't find a better pattern given these numbers.

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
see also
http://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.898492.html