A continuous random variable XXX has PDF f(x)=e−xf(x) = e^{-x}f(x)=e−x for x≥0x \ge 0x≥0. What is P(X>2)P(X > 2)P(X>2)?
e−2e^{-2}e−2
1−e−21 - e^{-2}1−e−2
e2e^{2}e2
2e−22e^{-2}2e−2