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 Apr12 awarded Autobiographer Jan16 awarded Yearling Dec11 awarded Caucus Jan16 awarded Yearling May9 awarded Caucus Mar24 accepted What's the expected number of coin tosses in order to get a sequence HHTTHH? Mar24 comment What's the expected number of coin tosses in order to get a sequence HHTTHH? You will do a long list of tosses, as long as you get HHTTHH, you will stop, count on average how many times you need to toss in order to get HHTTHH. Mar24 asked What's the expected number of coin tosses in order to get a sequence HHTTHH? Mar24 comment $\lim_{x\to\infty} x^{1+1/x}-x-\log x$ and $\lim_{x\to\infty}\frac{x^{1+1/x}-x}{\log x}$ I think it is putnam contest problem Mar24 comment Integration of normal cdf * normal pdf It seems very close your question: quant.stackexchange.com/questions/7505/… Mar23 comment This population will be extinct or not After a very long time Mar23 revised This population will be extinct or not added 23 characters in body Mar23 asked This population will be extinct or not Mar23 comment How many boxes will be empty? Great solution, I never thought about Poisson distribution Mar23 accepted How many boxes will be empty? Mar23 awarded Critic Mar23 awarded Editor Mar23 comment How many boxes will be empty? I mean on average Mar23 revised How many boxes will be empty? added 12 characters in body Mar23 asked How many boxes will be empty?