Brain Teaser

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A sort of trading-related (via probability) brain teaser for you

T2W are feeling festive and have a Christmas lottery; T2W members can buy as many tickets as they like, and 1 in 1000 tickets are winners (each winner gets... it doesn't matter what each winner gets, it's an imaginary competition).

How many tickets do you need to buy in order to have more than a 50% chance of holding at least one winning ticket?


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