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2015-09-07T19:50:57+08:00

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9 , 4 , -1 , -6, -11

As we could noticed, the number is decreasing. And to know the value it decreases, we should subtract the first to the next number.
 9 - 4 = 5
4 - (-1) = 5

So It always decreases by 5.

So let's continue, 
9, 4, -1, -6, -11, ?, ?, ?

-11 - 5 = -16

So, next to -11, is -16

9, 4, -1, -6, -11, -16, ?, ?

-16 - 5 = -21 

So next to -16, is -21

9, 4, -1, -6, -11, -16, -21, ?

-21 - 5 = -26

9, 4, -1, -6, -11, -16, -21, -26

The next number is -16, the 8th number is -26.



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