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The pattern followed is : $$a$$ # $$b=c$$ $$\equiv a^2+b^2=c^2$$
Eg :- $$(6)^2+(8)^2=36+64=100=(10)^2$$
and $$(5)^2+(12)^2=25+144=169=(13)^2$$
Similarly, $$(9)^2+(40)^2=81+1600=1681=(41)^2$$
=> Ans - (C)
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