Question

In each of the following question, select the related number from the given alternatives.
$1/9$ $:$ $1/81$ $:$ $:$ $1/13$ $:$ $?$

• A. $1/169$
• B. $1/125$
• C. $1/120$
• D. $1/127$

Answer 1

The correct option is A $1/169$

$\frac{1}{81}=\frac{1}{9^2}$

Similarly,

$\frac{1}{169}=\frac{1}{{13}^2}$

Hence, A is the correct option.