Question

In the given question, select the related number from the given alternatives.
$16$ $:$ $4$ $:$ $:$ $9$ $:$ $?$

• A. $4$
• B. $25$
• C. $1$
• D. $2$

Answer 1

Answer: (C)

$1$

Taking LHS,

The two numbers follow the relation that first number is a perfect square of some number $a$ while the second number is the perfect square of $a-2$,i.e.

$\Rightarrow 4^2=16$ and $(4-2{)}^2=2^2=4$

This means that the $?$ should be replaced by

$\Rightarrow (\sqrt{9}-2{)}^2=(3-2{)}^2=1^2=1$

Hence, the correct answer is option $C$