Let X1, ...,Xn be a random sample from the distribution with a density f(x; ,) = e(x) for x and 0 otherwise. Determine

Let X1, ...,Xn be a random sample from the distribution with a density f(x; λ,θ) = λe−λ(x−θ) for x ≥ θ and 0 otherwise. Determine a pair of jointly sufficient statistics for parameters λ and θ.