Instructions

In the following number series, a wrong number is given. Find out that wrong number.

Question 137

16 19 21 30 46 71 107

Solution

The pattern here followed is : 

107 - 71 = 36 = $$6^2$$

71 - 46 = 25 = $$5^2$$

46 - 30 = 16 = $$4^2$$

30 - 21 = 9 = $$3^2$$

21 - 17 = 4 = $$2^2$$

17 - 16 = 1 = $$1^2$$

Thus, 19 is wrong


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