Question 9

In the following question, select the related number from the given alternatives.
9 : 81 :: 11 : ?

Solution

The logic here is

9$$^2$$ = 81 $$\longrightarrow\ $$ $$\text{first number}^2=\text{second number}$$

Similarly, $$\text{third number}^2=\text{fourth number}$$

$$\therefore\ $$Fourth number = 11$$^2$$ = 121

Hence, the correct answer is Option C

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In the following question, select the related number from the given alternatives.9 : 81 :: 11 : ?