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  1.  

    What is the unit digit in {(6374)1793 x (625)317 x (341491)}?
    2. A.

    0 
    B.

    2
    C.

    3
    D.

    5

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    Answer : Option A

    Explanation :

    Unit digit in (6374)1793 = Unit digit in (4)1793

        = Unit digit in [(42)896 x 4]

        = Unit digit in (6 x 4) = 4

    Unit digit in (625)317 = Unit digit in (5)317 = 5

    Unit digit in (341)491 = Unit digit in (1)491 = 1

    Required digit = Unit digit in (4 x 5 x 1) = 0.

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