0 votes 0 votes The casual signal with $z$-transformer $Z^{2}\left ( Z-a \right )^{-2}$ is ($u[n]$ is the unit step signal) $a^{2n}u\left [ n \right ]$ $\left ( n+1 \right )a^{n}u\left [ n \right ]$ $n^{-1}a^{n}u\left [ n \right ]$ $n^{2}a^{n}u\left [ n \right ]$ new gateee-2021 + – Arjun asked Feb 19, 2021 • edited Feb 25, 2021 by soujanyareddy13 Arjun 15.9k points answer comment Share See all 0 reply Please log in or register to add a comment.