Please help with the following question:

Assume that individual lifetime 7 follows a Geometric distribution: P(T = x) = (1 - 1) x) at age of x and the intensity / from a given n independent observations 71, ..., T, of T. (a) Show that S(x)= (1-1). Hint: Recall that P(T 2 x) = Er, P(T = n) and for |0)