The Unit digit in the expression (2157)^{173} is :

  • Option 1)

    5

  • Option 2)

    7

  • Option 3)

    9

  • Option 4)

    1

  • Option 5)

    3

Answers (1)

        2157^{173}

7^{173}= (7^{4})^{43}.7

=1^{43}.7

=7

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