Question 1Let (Zn)n2Nbe a time-homogeneous Markov process. Then (Zn)n2Nis amartingale.YESNONo answerQuestion 2Let (Mn)n2N0be a stochastic process withM0=10suchthatboth(Mn)n2N0and (M2n)n2N0are martingales. Then (M5n)n2N0is also a martingale.YESNONo answer