Let X∼Exp(1)X \sim \text{Exp}(1)X∼Exp(1). What is P(X>2∣X>1)P(X > 2 | X > 1)P(X>2∣X>1)?
e−1e^{-1}e−1
e−2e^{-2}e−2
1−e−11 - e^{-1}1−e−1
e−1/2e^{-1/2}e−1/2