Question

Complete the series: 5, 9, 41, 71, 109, ?

Answer 1

Answer:

We gotta find the patter.

I think you're actually looking for the series: 5, 19, 41, 71, 109. ...

The rule of this sequence is:

Number (x) minus the previous one (y) plus the number again (x) plus 8.

In a math formulation: z = (x-y)+x+8

Let's take 5 and 19 as an example.

z = (19-5)+19+8

z = 41

Now using 71 and 109

z = (109-71)+109+8

z = 155

5, 19, 41, 71, 109. 155 and so on