Gamamal
Reputation
29,312
367/400 score
 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 added 1 character in body 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