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Broadcasting is a basic data dissemination technique, which has a number of applications such as address resolution and route discovery. While data broadcasting has many advantages, it introduces some problems known as broadcast storm problems, which causing a lot of contention, redundant retransmission and collision. In this paper our objective is to reduce the number of retransmission as well as to obtain less number of collisions. A good probabilistic broadcast protocol can achieve high save rebroadcast and low collision. In this paper, we propose a probabilistic approach that calculates the rebroadcast probability according to the number of neighbour's nodes when nodes move according to random way point mobility model and compare it with simple flooding, adjusted probabilistic flooding [4,7] and dynamic probabilistic flooding  schemes. Simulation results show our improved approach performs better than simple flooding, adjusted probabilistic flooding [4,7] and dynamic probabilistic flooding .