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Mobile hidden station and neighborhood capture problems severely affect the communication in the MAC layer of a mobile ad hoc network. IEEE 802.11 cannot prevent blocking due to neighborhood capture problem and collisions due to mobile hidden station problem. Extended reservation-Aloha (ERA) solves these two problems in a probabilistic manner along with solving widely known hidden station and exposed station problems. This paper provides a probabilistic view of ERA to neighborhood capture and mobile hidden station problems. The analysis shows that the channel accessing probability of a station facing neighborhood capture problem is more than 90 percent with 60 percent traffic.