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Old 11-15-2008, 01:20 PM   #6
Phanuthier
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Chances aren't really that far off, actually. Yeah you have 7 digit phone numbers (minus area code) but for cell phone use, there's only a few different first-3 digits. So, the variation happens in the last 4 digits, and assuming you have a similar chance of getting each digit, the chance of having the same didgits (4-6, inclusive) is (1/1000 x probability of the first 3 digits)

Now I don't know how many variations there are to cell phone numbers, but assuming its 20,

1/1000 x 1/20 = 1/20,000
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