Total persons in class = Arhin’s rank from the top + Arhin’s rank from the bottom - 1 = 30 + 48 - 1 = 78 - 1 = 77 If his rank became 57 from the top: Arhin’s rank from the bottom = Total persons in class - Arhin’s rank from the top + 1 = 77 - 57 + 1 = 20 + 1 = 21 Hence, the correct answer is (C).
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