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Group buying is becoming an increasing important trend for electronic marketplaces. In order to enhance purchase willingness of customers, there is a need to adopt the concept of the bargaining in online group-buying. This research is solved through on process of generating offers by a fuzzy inference system. Three bargaining strategies found in the literature are used in forming strategies of pricing mechanism. Experimental results indicate that our model can be accepted and is used again by most customers. Moreover, the increase bargaining strategy is the most satisfying for customers.