Calculating Conditional Expectation for Continuous and Discrete Random Vectors

[dror_l]

Hi,

Let x,z continuous random vectors and n discrete random vector: n=[n1,n2,...].
I'm trying to find for instance, E_z|n3{ E_n|z(x)} = ?.

Thanks...

 

[EnumaElish]

Can you explain your notation? Do you have two questions, E_z|n3 = ? and E_n|z(x) = ?