What is the probability P(X=0)P(X=0)P(X=0) for Poisson(λ=0.5)Poisson(\lambda=0.5)Poisson(λ=0.5)?
e−0.5e^{-0.5}e−0.5
e0.5e^{0.5}e0.5
0.50.50.5
1−e−0.51 - e^{-0.5}1−e−0.5