Railways R.R.C. (Jabalpur) Solved Paper Held on 1st Shift 30-11-2014

  • question_answer Find the unit digit in the product \[{{(4378)}^{245}}\times {{(621)}^{72}}-\]

    A) 5                     

    B)   2

    C) 7                                 

    D) None of these

    Correct Answer: D

    Solution :

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

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