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The number x is a positive odd integer. If the unit digit
Wednesday 26 October 2016, by
The number x is a positive odd integer. If the unit digit of x^3 is subtracted from the unit digit of x^2, it results in 0. What is the unit digit of the number x + 7? (1) The unit digit of the product of 105 and x is 5. (2) When x is divided by 5, it leaves no (...)
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