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| | Phone Number Permutations |
 | | My thought was to try to figure out the number of repeating digits in the average phone number, and take it from there. |
 | | The "probablility" of an event "P" is, by definition, the reciprocal of the number of elements of the entire set, or of an identifiable sub-set, call it "N", that have some common property. |
 | | The number of four digit phone numbers, "-defg" is exactly the same except that 'd', 'e', 'f', 'g' can EACH INDEPENDENTLY have one of the ten integer values: 0, 1, 2,..., 9. |
| www.newton.dep.anl.gov /askasci/math99/math99170.htm (1159 words) |
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