In modeling the number of claims filed by an individual under an automobile policy during a three-year period, an actuary makes the simplifying assumption that for all integers n ≥ 0, p_{n+1} = p_n / 3 where p_n represents the probability that the policyholder files n claims during the period. Under this assumption, what is the probability that a policyholder files two or more claims during the period given that the holder files one or more claims?