Question

Which number should replace ? to complete the series

$6:18::4:?$

• A. $2$
• B. $3$
• C. $8$
• D. $16$
• E. $24$

Answer 1

The correct option is C $8$

Here, the relationship is: $x:\frac{x^2}{2}$.
Similarly, $\frac{4^2}{2}=8$
Hence, option (C) is the correct answer.