If A is a skew-symmetric matrix of order n , then

$a_{ij}=\frac{1}{a_{ij}}$, for all values of i and j. $a_{ij}=0, $ where i= j $a_{ij}≠0, $ for all values of i and j $a_{ij}≠0$ where i = j only

$a_{ij}=0, $ where i= j

The correct answer is Option (2) → $a_{ij}=0, $ where i= j as $a_{ij}=-a_{ji}$ for skew symmetric matrices. for $i=j$ (diagonal elements) $a_{ij}+a_{ji}=0$ $a_{ij}+a_{ij}=0⇒a_{ij}=0$ (where $i = j$)