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Jul
25
awarded  Famous Question
Jun
20
awarded  Famous Question
May
31
accepted Find all numbers divisible by 25, that begin with 6.
May
23
asked Find all numbers divisible by 25, that begin with 6.
Mar
28
accepted Prove, that x, y, z fulfill this equation
Mar
28
comment Prove, that x, y, z fulfill this equation
I've just edited the question, I'm sorry for the mistake. Now it seems to be clear :).
Mar
28
revised Prove, that x, y, z fulfill this equation
added 18 characters in body
Mar
28
asked Prove, that x, y, z fulfill this equation
Dec
16
awarded  Caucus
Dec
8
awarded  Promoter
Dec
2
accepted Relation between edgelengths in a tetrahedron with two right angles and three equal edges
Dec
2
asked Relation between edgelengths in a tetrahedron with two right angles and three equal edges
Dec
2
revised Prove that 3 points are in straight line.
deleted 83 characters in body; edited tags
Dec
2
accepted Gathering problem
Dec
2
awarded  Popular Question
Dec
1
accepted Prove that 3 points are in straight line.
Dec
1
accepted Area between 3 curves
Dec
1
asked Prove that 3 points are in straight line.
Dec
1
comment Gathering problem
I pretty much understand your solution, but let's take for 8: why is that $$6k+8$$?
Nov
29
comment Gathering problem
I drew a graph and now I see why it's for n (even), that are bigger or equal to 6, but I can't write a proper solution.