Consider the random process defined as X$[$n$]=$ U $[$n$]$ U $[$n $1]$ for $$ $<$ n $<$ $,$ where

U $[$n$]$ is an IID random process with each U $[$n$]$ having a mean of zero and a variance of one.

Find its mean sequence and ACS of U $[$n$]$ and X$[$n$].$ Find the PSD of U $[$n$]$ and X$[$n$]$