The accused Venkata Srinivas Pilla, P Ashwin and B Shivudu committed the crime in the night of November 13 after they lured the victim of getting his old currency notes exchanged with the new ones in Seethpalmandi area, Osmania University police station Inspector, V Ashok said.
Two more members of the gang, Pavan and Krishna, are still at large, he said.
Venkata contacted the victim through an acquaintance and went to his place along with Ashwin. He then introduced him as cashier of a state-run bank and assured of getting the old notes exchanged, the inspector said.
While on the way, Shivudu along with Pavan and Krishna, impersonating as policemen, intercepted their bike and started quizzing the victim, who was carrying a bag loaded with cash.
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They beatup the victim and threatened him of dire consequences and then forcibly took away the cash, other valuables from him and fled, the officer said.
Venkata and Ashwin, who kept quiet during the entire incident, then made the victim board an auto-rickshaw and asked him to go home.
Later, the victim lodged a complaint and a case of dacoity was registered.
A hunt has been launched to nab the remaining two members, the officer added.