$$\sqrt{\text{AFI}}$$ : 13 :: $$\sqrt{\text{DDA}}$$ : ?

Solution

$$\sqrt{\text{AFI}}$$ = $$\sqrt{169}$$ = 13

Since A =1, F = 6, I = 9

Similarly,

$$\sqrt{\text{DDA}}$$ = $$\sqrt{441}$$ = 21

$$\therefore\ $$ $$\sqrt{\text{DDA}}$$ is related to 21 in the same way $$\sqrt{\text{AFI}}$$ is related to 13

Hence, the correct answer is Option A

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