Solution
In each column, the number at the end is obtained by adding the squares of other two numbers.
Eg :- $$(12)^2+(16)^2=144+256=400$$
$$(13)^2+(17)^2=169+289=458$$
Similarly, $$(11)^2+(x)^2=221$$
=> $$x^2=221-121=100$$
=> $$x=\sqrt{100}=10$$
=> Ans - (A)
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