Given X∼Poisson(λ)X \sim \text{Poisson}(\lambda)X∼Poisson(λ), which expression represents P(X≥1)P(X \geq 1)P(X≥1)?
1−e−λ1 - e^{-\lambda}1−e−λ
e−λe^{-\lambda}e−λ
λe−λ\lambda e^{-\lambda}λe−λ
1−λe−λ1 - \lambda e^{-\lambda}1−λe−λ