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Number of different binary matrices

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#combinatorics #matrices
118
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Changing the eccentricity of a vertex from $5$ to $4$.

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#combinatorics #discrete-mathematics #graph-theory #geometric-construction
85
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Solution to $(1+a_i-a_j)(1+a_j-a_k)(1+a_k-a_i)=(1+a_j-a_i)(1+a_i-a_k)(1+a_k-a_j)$

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#real-analysis #linear-algebra #sequences-and-series #combinatorics #number-theory
241
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How many squares can I select from chess board

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#combinatorics #combinations #chessboard
1.9k
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Random Bridge Hand w Cards of exactly two suits

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#probability #combinatorics #combinations #card-games
109
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Number of ternary sequences of length $n$ with the property that $|x_i - x_{i - 1}| = 1$ for each $i$ such that $2 \leq i \leq n$

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#combinatorics #combinations
64
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Find An Equation that Evaluates to 4 and 6

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#combinatorics #permutations
53
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Probability without replacement of rhinos

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#probability #combinatorics
74
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Fock-space-related combinatorial problem

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#combinatorics #optimization #discrete-optimization
103
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How to reconstruct a polynomial given $P(a),P(2a),P(3a),...$?

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#real-analysis #linear-algebra #sequences-and-series #combinatorics #polynomials
43
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Reducing $\frac{B!(C-B)!}{A!(B-A)!}$ where $A \le B \lt C$

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#combinatorics #factorial
730
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Random Gift Giving at a Party - Combinatorics Problem

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#probability #combinatorics
191
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Completing the proof for a combinatorics question from OIM 1994

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#combinatorics #contest-math
1.7k
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Election Outcomes - Combinatorics Problem

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#combinatorics
1.2k
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(2-D Random Walk) Probability of Returning to Origin

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#probability #combinatorics #logic #random-walk #expected-value

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