Solution
The pattern followed is that in each column, the sum of squares of first two numbers is equal to the last number.
Eg :- $$(17)^2+(8)^2=289+64=353$$
and $$(13)^2+(11)^2=169+121=290$$
Similarly, $$(15)^2+(x)^2=274$$
=> $$x^2=274-225=49$$
=> $$x=\sqrt{49}=7$$
=> Ans - (D)
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