posted by [identity profile] atreic.livejournal.com at 12:26pm on 19/11/2013
From a helpful friend's facebook message:

It sounds like a variant on the coupon collector's problem: http://en.wikipedia.org/wiki/Coupon_collector%27s_problem (the variant being you already have 3 of the `coupons'). I haven't read the wiki article in any detail; I just knew the name of the problem.

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