The sum of 'n' terms of an AP is given by the expression 3n²-2n. Find the AP and find its 21st term.
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In the early 21st century the Adivasi population of India was more than 84 million, with the majority living in the northeastern states of Arunachal Pradesh, Mizoram, and Nagaland. Smaller numbers inhabit the hills and forests of central and southern India as well as the Andaman and Nicobar Islands.
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