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seen Dec 12 '13 at 0:31

Apr
9
awarded  Popular Question
Mar
19
awarded  Popular Question
Jan
10
awarded  Yearling
Nov
10
awarded  Popular Question
Oct
24
comment What is the expected number of rounds that everyone get back their own ball?
Ya, that's what i have thought but the $x$ can be infinity right? And if $x$ is infinity, i think the expression of the expection is kind of weird and i am not sure how the expression would be like
Oct
24
comment What is the expected number of rounds that everyone get back their own ball?
Sorry, when i get deeper thought to the solution i get a little bit confused. Could you explain more about the part that once you find expected value of n people is 1 then you claim the expected round is n. Can it be Written in terms of the Random Variable? The reason i get confused is when finding the expected values of the number of rounds, it seems there could be infinite many so i dont quite get although it sounds true.
Oct
21
accepted What is the expected number of rounds that everyone get back their own ball?
Oct
21
asked What is the expected number of rounds that everyone get back their own ball?
Oct
21
accepted If $G$ is a finite group, then $\operatorname{ord}S(a)=\operatorname{ord}(G)/\operatorname{Ord}(C(a))$
Oct
15
asked If $G$ is a finite group, then $\operatorname{ord}S(a)=\operatorname{ord}(G)/\operatorname{Ord}(C(a))$
Oct
15
revised Prove that the automorphism group of the symmetric group on three elements is soluble (solvable)
edited title
Oct
14
asked Prove that the automorphism group of the symmetric group on three elements is soluble (solvable)
Oct
13
awarded  Popular Question
Sep
30
revised How can one know how many possible abelian and non abelian group be formed from a given number of elements
deleted 4 characters in body
Sep
30
comment How can one know how many possible abelian and non abelian group be formed from a given number of elements
@MarkBennet i made some mistake sorry
Sep
30
revised How can one know how many possible abelian and non abelian group be formed from a given number of elements
edited tags
Sep
30
comment How can one know how many possible abelian and non abelian group be formed from a given number of elements
@Clayton I have tried to search this theorem and i found so many different theorem about this, there is even a book talks about this theorem but i am not so sure how the theorem is related. What are the most important result derived from this theorem?
Sep
30
asked How can one know how many possible abelian and non abelian group be formed from a given number of elements
May
7
awarded  Caucus
Apr
28
comment Confidence interval of a random variable with infinite mean. (St. Petersburg paradox)
What is the probability of getting $2^k,k