Answer:
The variation is joint variation.
Step-by-step explanation:
The given equation is,
[tex]I=c\cdot m\cdot n[/tex]
where
c is the proportionality constant.
So,
[tex]I\propto m\cdot n[/tex]
This can be segregated as,
[tex]I\propto m[/tex] and [tex]I\propto n[/tex]
Therefore, I is in direct variation with m and n separately. But as both variations are of same type, so I is in joint variation with m and n.
