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age 20
visits member for 3 years, 7 months
seen Dec 8 at 10:20

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Dec
8
comment Help me finding closed form of sum of 4 elements
@Lucian Hey, thanks for this great observation! But now i'm stuck with similiar sum $$\frac{1}{x-1} \sum_{i} \binom{i}{k-i} (\frac{x}{1-x})^i$$ i have no idea how to get rid of this last term of sum. I know that $$\sum_{i} \binom{i}{k-i} = F_{k+1}$$, i'd appreciate some more help, Cheers!
Dec
7
asked Help me finding closed form of sum of 4 elements
Dec
4
accepted Probability of drawing white ball from last urn
Dec
4
comment Probability of drawing white ball from last urn
Yes, sorry for that. First we draw from 1st urn, put it to 2nd urn, draw from 2nd urn, put it to 3rd urn and so on
Dec
4
revised Probability of drawing white ball from last urn
added 23 characters in body
Dec
4
asked Probability of drawing white ball from last urn
Nov
14
comment Probability of winning more than half of the games with stronger opponent
Yeah, i was stuck there, this problem seems a little bit hard.
Nov
13
comment Probability of winning more than half of the games with stronger opponent
@Ritz My intuition was that answer will always be some low $N$. Cause if $N=1$ then we want need to win 2 matches, so probability of that is $p^2$ if $N=2$ then we need to win 3 matches or 4 matches. if $N=3$ then we need to win 4,5 or 6 matches. To me it seemed like random variable of number of won matches with binomial distribution, but i was stuck here... I'd appreciate some help.
Nov
13
asked Probability of winning more than half of the games with stronger opponent
Oct
18
awarded  Popular Question
Oct
4
comment The probability that 7 people taking an elevator will leave it in configuration 3-2-1-1
I have no idea why i calculated C(10,4) as 630... Woops!
Oct
4
accepted The probability that 7 people taking an elevator will leave it in configuration 3-2-1-1
Oct
3
asked The probability that 7 people taking an elevator will leave it in configuration 3-2-1-1
Sep
26
awarded  Popular Question
Sep
23
awarded  Notable Question
Sep
12
comment Number of partitions of number n and number 3n
yes you are right... thanks for pointing that out, honestly i don't remember what version i used on the exam
Sep
12
accepted Number of partitions of number n and number 3n
Sep
12
comment Number of partitions of number n and number 3n
wow that's really smart but i'm really in need of (dis)agreeing with my idea, thanks
Sep
12
asked Number of partitions of number n and number 3n
Aug
31
accepted Estimating the remainder for Mac Laurin's series