As per the seat adjustments, the Congress is contesting nine seats, the JMM four and the RJD one.
PCC general secretary Shailesh Sinha said after a meeting chaired by PCC president Sukhdeo Bhagat and attended by the leaders of JMM and RJD, that the parties pledged support to each other and decided to contest "seriously" without any "friendly" bouts.
Former Union minister and Congress candidate from Ranchi, Subodh Kant Sahay, who was also present in the meeting, said a committee for coordination among the allies would be set up for "smooth campaigning".
"He will file his nomination papers on March 22. The next day party president Lalu Prasad will address two election meetings in Palamau LS constituency," Kumar said.