Question

In each of the following question, select the related number from the given alternatives.
$8$ $:$ $81$ $:$ $:$ $64$ $:$ $?$

• A. $525$
• B. $625$
• C. $125$
• D. $137$

Answer 1

Answer: (B)

$625$

$8:81=\{2^3:(2+1{)}^4\}$

Similarly,

$64:625=\{4^3:(4+1{)}^4\}$

Therefore, $625$ is the required number.

Hence, B is the correct option.