8 5 4 7 18 ?

Solution

Let the missing number be y

here the pattern is

5 - 8 = -3

4 - 5 = -1

7 - 4 = 3

18 - 7 = 11

y - 18 = m .......(1)

Now as we can see that the difference between consecutive terms of this series is increasing by $$(2)^n$$, i.e

-1 - (-3) = 2

3 - (-1) = 4

11 - 3 = 8

m - 11 = 16 .....(2)

From 1 and 2

y = 45

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