Question

In each of the following question, select the related number from the given alternatives.
$196$ $:$ $169$ $:$ $:$ $81$ $:$ $?$

• A. $64$
• B. $72$
• C. $100$
• D. $144$

Answer 1

Answer: (A)

$64$

In this type of question we have to find the Relation In First one and after that this relation will be applied to Next one.
we have to find the Relation in $196:169$
and the same Relation will be applied to $81:?$
(i) $196:169$
Relation is
$[\sqrt{\left(196\right)}-1{]}^2=(169)$
Applying same relation to $81:?$
$[\sqrt{\left(81\right)}-1{]}^2=(64)$
So the Answer is $81:64$