Let XXX be a Poisson random variable with E[X]=2E[X] = 2E[X]=2. What is P(X=1)P(X=1)P(X=1)?
2e−22e^{-2}2e−2
e−2e^{-2}e−2
4e−24e^{-2}4e−2
0.5e−20.5e^{-2}0.5e−2