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Trading cards (Posted on 2002-05-03) Difficulty: 3 of 5
A trading card series has 200 different cards in it, which are sold in 5-card packages.

Each package has a random sampling of the cards (assume that any card of the 200 has an equal chance of being in a package).

On the average, how many packages will need to be bought to collect the complete series if...

  • A: all the cards in a package will always be different
  • B: a package can have repeats

  • See The Solution Submitted by levik    
    Rating: 4.1818 (11 votes)

    Comments: ( Back to comment list | You must be logged in to post comments.)
    re(2): Analytic solution, A and B missing parens added | Comment 28 of 36 |
    (In reply to re: Analytic solution, A and B missing parens added by Charlie)

    Arrrgggh! On that previous post all my Sigmas turned to double daggers and my ellipes (...s) turned to squares, from copying from MSWord and pasting. Read that accordingly.
      Posted by Charlie on 2003-02-05 08:36:48

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