In each row, for the numbers $$a$$, $$b$$ and $$c$$, pattern is : $$c=sqrt{a}-sqrt{b}$$ Eg :- $$sqrt9-sqrt4=3-2=1$$ $$sqrt{36}-sqrt{25}=6-5=1$$ Similarly, $$sqrt{144}-sqrt{81}=12-9=3$$ => Ans - (A)
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