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Is this possible?Yes, always.
More generally, tampering is always possible, regardless of voting system. (Yes, even on a blockchain.) The best-practice mitigation of this risk is a physical ballot that can be re-counted. Electronic voting sacrifices this in exchange for speed.
That said, India is a big democracy. And despite redoubtable paper ballots, we still have an idiot constituency in America willing to buy any lie that makes their sports team or political party the “real” winner.
