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Number of combinations between two people

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#combinatorics
178
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If we listed all numbers from $100$ to $10,000$, how many times would the digit $3$ be printed?

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#combinatorics #permutations
40
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Rotation of people for an assessment event

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#combinatorics
57
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Coins to be put in empty purses

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#combinatorics #binomial-coefficients
368
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how many ways can the books be packed?

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#combinatorics
85
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Password Combination with Limitations

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#combinatorics #permutations #combinations
58
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Hypergeometric distribution - the formula works, but WHY?

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#combinatorics #probability-distributions
50
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GREEDY Method for a matrix

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#combinatorics #optimization
35
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number of unique strings in dictionary

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#combinatorics #permutations
1.4k
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How many arrangements of the digits $0,1...9$ are there that do not end with an $8$ and do not begin with a $3$?

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#combinatorics #discrete-mathematics #inclusion-exclusion
42
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10 numbers - combined two different numbers

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#combinatorics #elementary-number-theory
67
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Counting partitions of an $n$-element set.

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#combinatorics #set-partition
90
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Find a formula for $card(A)=n$

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#combinatorics #elementary-set-theory
76
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Does this lemma, which have an easy proof for rational numbers, also hold true for all real numbers?

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#combinatorics
53
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The least upper bound for $\frac{\sum_{i=0}^m{\binom{m}{i}x^i}}{\sum_{i=0}^{m}{x^i}}$

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#combinatorics #optimization #binomial-theorem #geometric-progressions

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