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