posted by [identity profile] 3c66b.livejournal.com at 01:50pm on 19/11/2013
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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