Question 1083509: 3, -6, 12, 4, 20, ? can not figure this out....
Answer by math_helper(2461)   (Show Source):
You can put this solution on YOUR website!
3,-6,12,4,20,n
I think n =  (?)
—
Based on the partial sequence, the differences are
-9, +18, -8, +16
So I'd guess the next difference would be -7, and 20-7 = 13.
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