Question

Choose the correct option that will replace the question mark in the given letter-number series.
$C4X,F9U,I16R,?$

• A. $K25P$
• B. $L25P$
• C. $L25O$
• D. $K25O$

Answer 1

The correct option is C $L25O$

$C\stackrel{+3}{\to }F\stackrel{+3}{\to }I\stackrel{+3}{\to }L$
$4\stackrel{+5}{\to }9\stackrel{+7}{\to }16\stackrel{+9}{\to }25$
$X\stackrel{-3}{\to }U\stackrel{-3}{\to }R\stackrel{-3}{\to }O$
Hence option $C$ is answer.