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Instructions
What should come in place of question mark (?) in the given number series ?
Solution
Let the missing number be x
9 - 4 = 5
20 - 9 = 11
43 - 20 = 23
84 -43 = 41
Let say that (x - 84 = y)
Now check the difference between the differences we got from consecutive numbers.
11 - 5 = 6
23 - 11 = 12
41 - 23 = 18
So y - 41 = 24
y = 65
x = 65 + 84 = 149
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