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4h
answered prove that this number contains two equal digits
6h
comment What math is needed for the inverse quantum problem?
some graduate level stuff
8h
answered Add or subtracts 1 to 9 numbers and get the answer 100
8h
comment Let $G,*$ a group and $a,b,c,d \in G$. Prove that …
where does $d$ go?
9h
comment Converting base 10 to base 52 using a bijective function
although it is true that if ID is a long long you can store at most 2^64 url's, while 52^{12}>2^{64}$. So if the URL is stored as a number you will only be able to manage URL's of small sizes (size 12 and below)
9h
comment Converting base 10 to base 52 using a bijective function
You got pranked unfortunately,
10h
comment Hall's theorem proof - capacity of middle edges
I'm sorry if you already knew this but just so you know there are quite a few simple proofs of Hall that don't use flows.
13h
comment prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number
Yes, that was the trick, if $n$ is the product of two numbers larger than $1$ then $n$ can't be prime. Proceeding by contradiction without using this trick seems hard, because you would have to assume the number is prime and reach a contradiction, but assuming the number is prime does not help us reach any other interesting observations in this case, which is what we need to reach a contradiction in the end.
13h
revised prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number
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13h
comment prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number
No problem, happy to help. Wow, those are some hardcore local competitions !
13h
revised prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number
added 180 characters in body
14h
comment prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number
I don't know, I think the point of the problem is to get to $1+a+a^2+a^3+a^4$ and then try to factor it appropriately for a long time (using the fact that you know the value of $a$).
14h
answered prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number
14h
revised If a die is thrown thrice. Find the probability that the largest score is three times the smallest.
added 4 characters in body
14h
comment If a die is thrown thrice. Find the probability that the largest score is three times the smallest.
Oh yeah the sum is $36$, I made a mistake there, fixed.
17h
comment If a die is thrown thrice. Find the probability that the largest score is three times the smallest.
Yes, you are on the right track!
17h
answered If a die is thrown thrice. Find the probability that the largest score is three times the smallest.
17h
answered Invalid function or invalid domain
17h
revised Invalid function or invalid domain
added 1 character in body
17h
revised Invalid function or invalid domain
added 1 character in body