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how many tribal groups are there in India?

Scheduled Tribes in India, as recognised the Constitution of the Indian Republic; a total of 645 district tribes. The term "Scheduled Tribes" refers to specific indigenous peoples whose status is acknowledged to some formal degree by national legislation. A collective term in use locally to describe most of these peoples is "Upajati" (literally "clans/tribes/groups").

http://en.wikipedia.org/wiki/List_of_Scheduled_Tribes_in_India