<we><edit> <!-- questions and answers -->
fourier-analysis
improper-integrals
multivariable-calculus
proof-verification
systems-of-equations
vector-spaces
hilbert-spaces
general-topology
limits
soft-question
calculus
commutative-algebra
arithmetic
functional-analysis
binomial-coefficients
graph-theory
set-theory
complex-analysis
measure-theory
statistics
expectation
notation
galois-theory
terminology
combinatorics
combinatorics
Order of alternating-sign-matrix function
combinatorics
logarithms
asymptotics
factorial
Problem about Pictures
combinatorics
graph-theory
How many different patterns to transport load with these condition?
combinatorics
discrete-mathematics
permutations
Relaxed Menage Problem - sitting arrangement for couples
combinatorics
inclusion-exclusion
How does $\dbinom{n}{k}\dbinom{n}{n - k}$ differ from $\dbinom{n}{k}$?
combinatorics
Construction Of Minimal Set With Sum Property
combinatorics
elementary-set-theory
Figuring out all possible combinations for a given circumstance
combinatorics
proof-verification
Zeta polynomial of the Boolean Lattice
combinatorics
order-theory
boolean-algebra
combinatorial-proofs
Calculating all possible combinations in string of letters/digits (they can repeat) if for example "B" and "8" aren't allowed to be next to each other
combinatorics
permutations
combinations
Combinatoric: How many binary strings of length 4 have exact two zeroes?
combinatorics
On the size of intersection of subsets
combinatorics
elementary-set-theory
Sum of rolls greater than the product
probability
combinatorics
dice
Rolling 5 dice, probability of a double.
probability
combinatorics
Points and lines in an infinite projective plane
combinatorics
projective-geometry
finite-geometry
Calculate $\sum\limits_{k=0}^{20}(-1)^k\binom{k+2}2$ without calculating each term separately
combinatorics
binomial-coefficients
combinations
6 periods and 5 subjects
combinatorics
What good algorithms are there for shuffling (scrambling) 1 to n objects?
combinatorics
permutations
random
poker
Time to first success for a simple event
probability
combinatorics
statistics
random-variables
Maximum volume of a parallelepiped
combinatorics
3d
Sum and product of 3 integer random variables
probability
combinatorics
statistics
random-variables
Random draw from bins
combinatorics
Inclusion/Exclusion Counting
combinatorics
What is expectation value of times to pick items out from the box which number of picked out items is random integer in each time?
probability
combinatorics
expectation
Rooks on a Chessboard
combinatorics
inclusion-exclusion
chessboard
Arrange the integers $1,2,\dots,n$ in a row such that the number of times that an integer is bigger than the previous integer is $m$.
combinatorics
combinations
Exam with 12 yes/no questions (half yes, half no) and 8 correct needed to pass, is it better to answer randomly or answer exactly 6 times yes?
probability
combinatorics
show that the maximum of $xy+ xz + yz$ is when $x = y = z$
combinatorics
algebra-precalculus
Choosing 4 cards randomly from a standard deck of 52 cards, what is the probability the 4 cards add up to 20? (Without Replacement)
probability
combinatorics
inclusion-exclusion: class distribution so that professor teaches the same two courses both semesters
combinatorics
inclusion-exclusion
Birthday problem: using $^nC_r$.
probability
combinatorics
probability-theory
binomial-coefficients
birthday
100 Prison Problem- Why does this solution not work?
combinatorics
graph-theory
puzzle
Number of triple of sequences
combinatorics
Distribute $30$ marks to $8$ problems
combinatorics
combinations
Finding the minimum cardinal value of intersection of 4 sets.
combinatorics
2 player throw darts alternately. Find the probability generating function and expected number of throws
probability
combinatorics
probability-theory
Say "red" with playing cards
probability
combinatorics
Why is this result using binomial coefficients true?
combinatorics
binomial-coefficients
combinations
binomial-theorem
number of ways putting m nonadjacent balls in a n*n*n chess board
combinatorics
graph-theory
3d
Union of each family of a list of subsets and of specific length, equaling to the original set?
combinatorics
Card Game Probability 13 Card Hand
probability
combinatorics
combinatorial-game-theory
card-games
inclusion-exclusion problem - sitting arrangement
combinatorics
inclusion-exclusion
Stacking math books
combinatorics
permutations
combinations
Inviting four people to dinner if one of them can be invited only if that person's two friends will be there as well
combinatorics
combinations
knights and knaves... and a traveller
combinatorics
contest-math
Optimal strategy for guessing subset of given size
probability
combinatorics
How was this formula arrived?
combinatorics
Is there any formula for the following permutation?
combinatorics
permutations
Arrangements of 3 baskets, 2 misses through Combinations or Permutations?
probability
combinatorics
permutations
combinations
Finding out two unknown constants of a division
probability
combinatorics
algebra-precalculus
statistics
Prove the set partition identity via double counting argument
combinatorics
binomial-coefficients
Recurrence relation problem — the forbidden sequences
combinatorics
recurrence-relations
$N$ series of $n$ independent trials, and Time to first success for equiprobable events
probability
combinatorics
markov-chains
Can this product be written as a summation?
calculus
combinatorics
summation
products
Number of ways to connect sets of $k$ dots in a perfect $n$-gon
combinatorics
group-theory
combinations
polygons
Probability that all three dice show different numbers exactly two times when rolled three times simultaneously
probability
combinatorics
How many $6$-digit numbers contain each of the digits $1$, $2$, and $3$ at least once?
combinatorics
Probability questions in involving combinatorics
probability
combinatorics
creating a Free-For-All (1v1v1v1) schedule for 20 teams over 13 weeks
combinatorics
combinatorial-designs
Characterizing multisets that are the sum of two permutations
combinatorics
Convergence of $\sum_{m=0}^{n-1}\frac{1}{(n+2)!}\left|\sum_{k=0}^{m+1}(-1)^k\binom{n+3}{k}(m+2-k)^{n+1}\right|$ as $n\rightarrow\infty$
combinatorics
asymptotics
Can every partial transversal be extended to a maximum partial transversal?
combinatorics
graph-theory
matching-theory
Time to first success in case of increasing probability at each trial
probability
combinatorics
markov-chains
Find the value of $\sum_{k=1}^{n}k\binom{n}{k}$?
sequences-and-series
combinatorics
discrete-mathematics
summation
binomial-coefficients
Distributing $3$ identical prizes to $10$ players
combinatorics
How many combinations are possible in a $4 \times 4$ grid?
combinatorics
permutations
Graph with exactly K bridges
combinatorics
graph-theory
How many "marvelous" points inside a triangle.
combinatorics
geometry
Differentiating cases in counting problems
combinatorics
Need help to understand some combination of six digits
combinatorics
permutations
Beads on a Bracelet
combinatorics
How many 6-digit numbers can I write?
combinatorics
How many even integers are between 20000 and 70000 in which no digit is repeated?
combinatorics
Number of triplets of collinear points in a standard setting
combinatorics
Really Complicated Combinatorics
combinatorics
Stirling Numbers of the Second Kind $ \sum_{j= m}^n {j \brace m} (m+1)^{n-j} = {n+1\brace m+1} $
combinatorics
stirling-numbers
How many sequences with a maximum of four signs of the Morse alphabet can be formed?
combinatorics
How many even integers between $100$ and $1000$ have distinct digits?
combinatorics
How many different words can be made?
combinatorics
The Number Of Integer Solutions Of Equations
combinatorics
threshold graph and degree sequence proof
combinatorics
graph-theory
How many diagonals in a decagon?
combinatorics
Not a strictly mathematical question, but complex one nonetheless
probability
combinatorics
puzzle
Stirling Numbers $ \sum_{j= m}^{n-r} \binom{n}j {j \brace m} {n-j\brace r} = \binom{m} {m+r} {n\brace m+r} $ Combinatorical Proof or Algebraic
combinatorics
stirling-numbers
Summation of this series.
sequences-and-series
combinatorics
Towers 'n Tets problem.
combinatorics
graph-theory
How many shared numbers between all factors of 465 and all multiples of 3 between 20 and 100?
combinatorics
prime-numbers
combinations
prime-factorization
least-common-multiple
Casework on Cards
combinatorics
Random Walk (Combinatorics: number of ways to reach end of the straight line)
combinatorics
random-walk
Coin Toss Experiment Problem
probability
combinatorics
random-variables
combinations
Combinatorics in real life problems
combinatorics
Tight Acute Sets
combinatorics
3d
extremal-combinatorics
Circular Permutation, clockwise and counterclockwise can't be distinguished?
combinatorics
permutations
combinations
What is the algorithm to generate the cards in the game "Dobble" ( known as "Spot it" in the USA )?h
combinatorics
recreational-mathematics
card-games
Problem about clubs
combinatorics
graph-theory
Proving $|A+B| \geq |A|+|B| - 1$ for $A,B \subseteq \mathbb{Z}$ finite and non-empty
combinatorics
Why not count automorphisms when counting - total number of spanning trees in $K_5$
combinatorics
graph-theory
permutations
How to prove the maximum number of chords those can not across more than one other chord from points around the circle?
combinatorics
geometry
optimization
How many number of classes over matrices with $\pm 1$ entries are there, where equivalence means row/column permutation and multiplication?
linear-algebra
combinatorics
matrices
group-theory
permutations
Garden with mushrooms
combinatorics
Question about solving combinatorics.
probability
combinatorics
permutations
combinations