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New posts in combinatorics
How many such different permutations? [duplicate]
combinatorics
permutations
Maximal cardinality of Sidon set
combinatorics
additive-combinatorics
Using two coins to select a person fairly.
probability
combinatorics
contest-math
Closed form of factorial and cascading power sum
calculus
sequences-and-series
combinatorics
generating-functions
hypergeometric-function
Minimum number of subsets of $A$ of a given order that contain all possible pairs of elements of $A$
combinatorics
How many arrangements of the letters in the word CALIFORNIA have no consecutive letter the same?
combinatorics
The set $S=\{a+1,a+2, a+3,\dots,a+2015,a+2016\}$ with exactly 20 primes
combinatorics
analysis
number-theory
When does the game end?
probability
combinatorics
stochastic-processes
dice
What is the maximal number of subsets of a finite set, such that no one is the unions of some other ones? [closed]
combinatorics
$S$ be a collection of subsets of $\{1,...,100\}$ ; any two sets in $S$ has non-empty intersection , what is the maximum possible value of $|S|$?
combinatorics
How many different game situations has connect four?
combinatorics
recreational-mathematics
How many strings of four decimal digits do not contain the same digit twice?
combinatorics
What is the probability that the expectation value is the actual value in this experiment
probability
combinatorics
probability-theory
probability-distributions
Sum of 1.5-powers of natural numbers
combinatorics
power-series
Show that $\frac1{\sqrt{(n+\frac12) \pi}} \le\frac{1\cdot 3\cdot 5 ... (2n-1)}{2\cdot 4\cdot 6 ... (2n)} \le \frac1{\sqrt{n \pi}} $
combinatorics
inequality
gamma-function
Palindrome Subtraction
combinatorics
discrete-mathematics
computational-mathematics
Placing a kth adjacent term in a row of k-1 non-adjacent terms
combinatorics
combinations
generating-functions
A combinatorics problem related to Bose-Einstein statistics
combinatorics
Show that ${{2m} \choose {m}} \leq \frac{2^{2m}}{\sqrt{2m}}$.
combinatorics
inequality
binomial-coefficients
An old and interesting problem in combinatorics from Russia Mathematics Olympiad
combinatorics
contest-math
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