Asked by Mr. Alexander
A prime number less than 100 is selected randomly. What is the probability that its square has units digit 7?
Answers
Answered by
Steve
zero. No square ends in 7.
Only 1,4,5,6,9,0
Poke around a bit and you will quickly see why.
Only 1,4,5,6,9,0
Poke around a bit and you will quickly see why.
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