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  1. If the unit digit in the product 75 ? x 49 x 867 x 943 be 1, then the value of ? is
    1. 1
    2. 3
    3. 7
    4. 9
Correct Option: D

Let the value for ? be N
So N x 9 x 7 x 3 = a number with unit digit 1.
Clearly, the minimum value of N is 9.


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