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Find a good formulae

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#combinatorics #discrete-mathematics #combinations
114
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Review on my method for $Number$ $of$ $diagonals$ in a regular $n$-gon is $\frac12n(n-3)$

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#combinatorics #geometry #discrete-mathematics #proof-verification #combinations
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How many ways can a number be written as a sum of two non negative integers?

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#combinatorics #combinations
57
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How many ways are there?

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#combinatorics #combinations
271
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If there are four bakeries that each close one day a week, how many schedules are possible if at least one bakery is open each day?

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#combinatorics #permutations #combinations
457
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Binomial distribution: what is the probability of getting exactly 3 women from a draw of Y = 1 to 10?

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#probability #combinations #negative-binomial
89
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Why can’t we use multinomial theorem here?

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#combinatorics #combinations #multinomial-theorem
73
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Finding sum of digits of $m$

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#elementary-number-theory #permutations #combinations #self-learning #decimal-expansion
189
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Counting with repetition, how to determine which one is r and which one is n

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#combinatorics #discrete-mathematics #combinations
52
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Question on word combinations with exclusivity

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#combinatorics #discrete-mathematics #permutations #combinations #combinatorics-on-words
1.2k
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If $12$ distinct points are placed on a circle and all the chords connecting these points are drawn, at how many points do the chords intersect?

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#combinatorics #geometry #combinations
53
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Eight fair coins are flipped. Find the probability that 5 heads and 3 tails are obtained

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#probability #probability-theory #probability-distributions #permutations #combinations
1.2k
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What does this symbol denote?

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#combinatorics #permutations #combinations
183
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Probability of successful Secret Santa selection

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#probability #permutations #combinations
1.6k
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How many 4 digit numbers can be formed by digits 3, 1, 3, 1?

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#combinatorics #permutations #combinations

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