Instructions
In each of the following questions, select the related letters/word/number fromthe given alternatives.
Solution
Expression = 13 : 19 : : 21 : ?
Each digit is raised to the power of 2
Eg = $$1^2=1$$ and $$3^2=9$$
Similarly, $$2^2=4$$ and $$1^2=1$$
Thus, 21 : 41
=> Ans - (A)
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