Question
Find the missing number in the given number series.
/> 3, 7, 18, 38, 69, ?Solution
ATQ,
First differences:
7 - 3 = 4
18 - 7 = 11
38 - 18 = 20
69 - 38 = 31
Now, second differences:
11 - 4 = 7
20 - 11 = 9
31 - 20 = 11 → increases by 2 each time
Next second difference = 13
So, next first difference = 31 + 13 = 44
Next term = 69 + 44 = 113
Hence, missing number is 113
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