I need to find for each $3\le n\in N $ what is $C_n$ Diameter and his Complement graph Diameter and the same for each $1\le n\in N $ what is $P_n$ Diameter and his Complement graph Diameter.
Here is what i done: I found out for $C_n$ that its $\lfloor {n\over 2} \rfloor$ and his Complement $\lfloor {n-2\over 2} \rfloor$ I think that $P_n$ is just $n$ but i cant find his Complement Diameter is that correct? and how can i find the Complement Diameter