Random variables N and K have the joint PMF
![](https://test.transtutors.com/qimg/2945d010-2844-404a-a58f-985dd442059e.png)
Find the marginal PMF PN (n), the conditional PMF PK|N (k|n), and the conditional expected value E[K|N = n]. Express the random variable E[K|N] as a function of N and use the iterated expectation to find E[K]