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  1. What is the unit digit in (4137)754?
     

    2. A.

    1
    B.

    3
    C.

    7
    D.

    9

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    Answer : Option A

    Explanation :

    Unit digit in (4137)754 = Unit digit in {[(4137)4]188 x (4137)2}

    =Unit digit in { 292915317923361 x 17114769 }

    = (1 x 9) = 9

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