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Select the related word/ letters/ number from the given alternatives.
$$\sqrt{\text{AFI}}$$ : 13 :: $$\sqrt{\text{DDA}}$$ : ?
$$\sqrt{\text{AFI}}$$ = $$\sqrt{169}$$ = 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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