Let (An)n=N be an adapted stochastic process in the N-period model, and let XO E R. Given that the discounted stock price process is a Martingale process under the risk-neutral measure, show that the process (Xn) is a risk-neutral Martingale, where the process is defined recursively by the formula Xn+1 (1 + r) (Xn AnSn) + An Sn+1. Make sure to carefully and explicitly write out how you are using mathematical induction for this. n=N n=0 =