Find the unit digit of the expression: 888^888! + 222^222! + 333^333! + 777^777!. a.3 b. 4 c. 5 d. 6

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Find the unit digit of the expression: 888^888! + 222^222! + 333^333! + 777^777!. a.3 b. 4 c. 5 d. 6

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