Assume that \(X\), \(Y\), and \(Z\) are independent Poisson random variables, each with mean 1. Find
- \(\mathbf{P}(X+Y = 4) \)
- \(\mathbf{E}[(X+Y)^2]\)
- \(\mathbf{P}(X+Y + Z= 4) \)
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Assume that \(X\), \(Y\), and \(Z\) are independent Poisson random variables, each with mean 1. Find