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  1. What is the unit digit in the product (365 x 659 x 771)?

  2. A.

    1

    B.

    2

    C.

    4

    D.

    6

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    Answer : Option C

    Explanation :

    Unit digit in 34 = 1  Unit digit in (34)16 = 1

     Unit digit in 365 = Unit digit in [ (34)16 x 3 ] = (1 x 3) = 3

    Unit digit in 659 = 6

    Unit digit in 74  Unit digit in (74)17 is 1.

    Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3

     Required digit = Unit digit in (3 x 6 x 3) = 4.


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