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A-level probability question, to bring joy to children at Christmas:… - Sally's Journal — LiveJournal
November 19th, 2013
12:01 pm

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From:3c66b
Date:November 19th, 2013 01:50 pm (UTC)
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Can't you have a stab at this with expected values?

When you've bought 0 Octonauts, the expected number that you've got that you want is 3.

When you've bought 1, it's 3 + 5/8

When you've bought 2, it's 3 + 5/8 + (4 3/8)/8

When you've bought 3 ... and then your criterion for stopping is something like an expectation value of 7.2. Maybe.
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