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Wireless Sensor Network is an emerging branch of latest technology that is growing and improving day by day. Network lifetime management of sensor network is highly prioritized in its advancement issues. Routing techniques decide the transmission path in network that is main cause of energy consumption. In this paper three routing protocols LEACH, LEACH-C and PEGASIS are studied and compared on the basis of different factors that have to be considered while choosing methodology for particular project of wireless sensor network.