Question 18

Complete the series.
8, 9, 12, 19, 34, (…)

Solution

8, 9, 12, 19, 34, (…)

first difference

$$9 - 8 = 1$$

$$12 - 9 = 3$$

$$19 - 12 = 7$$

$$34 - 19 = 15$$

second difference

3 - 1 = 2

7 - 3 = 4

15 - 7 = 8

15 + 16 = 31

now add 31 to 34

34 + 31 = 65

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