SOLUTION: If there are 20 employees in office, what is probability that two or more will have the same last 5 digits in their social security numbers(in same order) ? Assume that all digits

Question 342461: If there are 20 employees in office, what is probability that two or more will have the same last 5 digits in their social security numbers(in same order) ? Assume that all digits 0 to 9 are equally likely.
Found 2 solutions by stanbon, vron247:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If there are 20 employees in office, what is probability that two or more will have the same last 5 digits in their social security numbers(in same order) ? Assume that all digits 0 to 9 are equally likely.
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Number of 5 digit sequences: 10^5 = 100000
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P(2 SS #'s have same last 5 digits) = 1/100,000
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Cheers,
Stan H.
Answer by vron247(1) (Show Source): You can put this solution on YOUR website!
Hello Stan,
I just noticed there is similar question answered by you but with different answer.
http://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.341115.html
Am now bit confused about correct solution.
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