Hi Santosh! There is not a number limit of how many individuals may join a team, per the rules teams of eligible individuals are eligible and:
"An Eligible Individual may join more than one Team and an Eligible Individual who is part of a Team may also enter the Hackathon on an individual basis.
If a Team is entering the Hackathon, they must appoint and authorize one individual (the “Representative”) to represent, act, and enter a Submission, on their behalf. The Representative must meet the eligibility requirements above. By entering a Submission on the Site on behalf of a Team you represent and warrant that you are the Representative authorized to act on behalf of your Team."