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Say there is a web service where I can request information about a random item. For a request each item has an equal chance of being returned.

If I keep requesting items and record the number of duplicates and unique, how do I estimate the total number of items?

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This question may get more interest, and be better suited to, stats.stackexchange.com –  David Roberts Apr 5 '11 at 23:38
oh OK, I will try there. Thanks. –  Richard Apr 6 '11 at 0:43
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