Hello Everyone!

I got this question:

X[n] and Y[n] are two DT independent DT processes, and Z[n] = X[n] x Y[n]. If X[n] and Y[n] are JWSS, is Z[n] WSS?

Here's what I'm doing

.

Now, this is what I know:

and is a function of .

Now, I'm stuck because I can't "expand" the probability . So I ask this:

If we have a process X[n], , is ?

Note: If the expressions are written correctly please point that out.

Any reply is appreciated!