A random variable XXX has PDF f(x)=λe−λxf(x) = \lambda e^{-\lambda x}f(x)=λe−λx. What is P(X>1/λ)P(X > 1/\lambda)P(X>1/λ)?
1−e−11 - e^{-1}1−e−1
e−1e^{-1}e−1
1/e1/e1/e
1−1/e1 - 1/e1−1/e