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https://www.bhavinionline.com/2015/09/what-comes-next-in-the-sequence-if-5-4-3-9-4215-then-7-2-7-4/
What Comes Next in the Sequence: If 5 # 4 # 3 # 9 = 4215 Then 7 # 2 # 7 # 4 = ?