• question_answer Find the unit digit in the product ${{(4378)}^{245}}\times {{(621)}^{72}}-$ A) 5                     B)   2C) 7                                 D) None of these

${{(4378)}^{245}}\times {{(621)}^{72}}={{(....8)}^{245}}\times {{(....1)}^{72}}$ $=(....8)\times (....1)$ $=....8$ Hence, the unit digit in the product as 8.