A prime number less than 100 is selected randomly. What is the probability that its square has units digit 7?

waffles  Apr 28, 2017


There is no possibility.......the prime will end either in 1, 3, 7 or 9


And the square of any number ending  in those digits will have a unit number of either 1 or 9



cool cool cool

CPhill  Apr 28, 2017

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