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20h
answered What is the minimum number of painted edges in the chessboard?
21h
answered how many jelly beans did each girl have at first?
22h
answered What is this binding function?
22h
answered pairwise balanced design has block size related to the number of elements.
22h
answered Collatz conjecture: Largest number in sequence with starting number n
1d
answered polynomial of $4^\text{th}$ degree, prove
2d
answered Easiest way of finding a root of permutation?
2d
answered Probability that two items selected from a mixed bag will be of particular sorts
2d
answered If two people temporarily covered the cost of \$20 for the 3rd person by paying \$10 each, how much would the 3rd person owe person 1 and 2?
2d
answered Modular Arithmetic, Pythagorean triples
2d
answered Partitioning elements into sets
2d
answered Factorial formula problem
2d
answered Factorial formula problem
2d
answered Multiples of 3 and 5.
2d
answered Find the number which is the sum of different consecutive integers
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
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
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
answered Turan's theorem - maximum number of edges.