Let XXX be a Poisson random variable with parameter λ\lambdaλ. Find E[2X]E[2^X]E[2X].
eλe^{\lambda}eλ
e2λe^{2\lambda}e2λ
eλ(2−1)e^{\lambda(2-1)}eλ(2−1)
eλ(e2−1)e^{\lambda(e^2-1)}eλ(e2−1)