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Jan
25
answered Factorial formula problem
Jan
25
answered Multiples of 3 and 5.
Jan
25
answered Find the number which is the sum of different consecutive integers
Jan
25
comment Find the number which is the sum of different consecutive integers
You didn't say what the problem is. Is it to find the smallest integer that can be written as the sum of 5,6 and 7 consecutive numbers?
Jan
25
awarded  Nice Answer
Jan
25
answered What kind of sequence is that ($1+2+2^2+\cdots+2^k$) and how it can be expressed in a short way?
Jan
24
revised Prove that any set of 2015 numbers has a subset who's sum is divisible by 2015
added 4 characters in body
Jan
24
answered Proving if $G$ has no cycles but by adding one edge between any two vertices will create a cycle then $G$ is a tree
Jan
24
comment Counting with restrictions.
Sure, my pleasure, I hope it helped. I am glad to answer any further questions.
Jan
24
comment Prove that any set of 2015 numbers has a subset who's sum is divisible by 2015
It means they leave the same remainder when you divide by 2015
Jan
24
revised Counting with restrictions.
added 165 characters in body
Jan
24
revised Prove that any set of 2015 numbers has a subset who's sum is divisible by 2015
added 171 characters in body
Jan
24
answered Counting with restrictions.
Jan
24
answered Prove that any set of 2015 numbers has a subset who's sum is divisible by 2015
Jan
24
comment $A\subseteq \{1,2,3, \ldots 2000\}, $ and for any $a,b\in A,\; |a-b|$ is not equal to 4 or 7,
It should. Thank you
Jan
24
revised $A\subseteq \{1,2,3, \ldots 2000\}, $ and for any $a,b\in A,\; |a-b|$ is not equal to 4 or 7,
edited body
Jan
24
revised Turan's theorem - maximum number of edges.
deleted 3 characters in body
Jan
24
comment Turan's theorem - maximum number of edges.
Oh yeah. Edges.
Jan
24
answered Turan's theorem - maximum number of edges.
Jan
24
comment Turan's theorem - maximum number of edges.
Nevermind, I see what you are thinking of, that is actually an excelent approach.