Hi I'm trying to solve the problem when studying for an upcoming test.
The given solution is $1.2503 e^{jnπ/4 -0.2991}$, and is found by computing $H(Ω)$ and evaluating this at $Ω=π/4$. when I try this I get $H(π/4)=(1/3)^8=0.000152$ and therefore the convolution is $0.000152e^{jnπ/4}$.
I'm not sure where I'm going wrong so any help would be appreciated so much!