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Using Inclusion/Exclusion to solve $x_1+x_2+x_3=15$ with $x_1,x_2\leq 5$ and $x_3\leq 7$ for non negative integers $x_1,x_2,x_3$

How many $8$-character passwords contain at least one digit and at least one upper case letter? [closed]

Exclusion Inclusion Principle Induction Proof

Losing at Spider Solitaire

Not divisible by $2,3$ or $5$ but divisible by $7$

inclusion-exclusion principle - challenging problem [closed]

Inclusion–exclusion principle [Proof verification]

Inclusion-exclusion principle: Number of integer solutions to equations

Proving $\sum_{k=1}^{n}{(-1)^{k+1} {{n}\choose{k}}\frac{1}{k}=H_n}$

Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions

Count permutations of $\{1,2,...,7\}$ without 4 consecutive numbers - is there a smart, elegant way to do this?

Closed form for $\left(-1\right)^{n}\sum_{k=0}^{n}\left(-1\right)^{k}\binom{n}{k}2^{\binom{k}{2}}$

Partitions and Bell numbers

Probability of complete coupon set in $K$ boxes where a box has $N$ distinct coupons?

Famous uses of the inclusion-exclusion principle?

The Matching Problem/Derangements - n letters to n people

New posts in inclusion-exclusion

Using Inclusion/Exclusion to solve $x_1+x_2+x_3=15$ with $x_1,x_2\leq 5$ and $x_3\leq 7$ for non negative integers $x_1,x_2,x_3$

Permutation of n objects with restriction of adjacent pairs

Intuition for Inclusion-Exclusion Principle

How is the inclusion map both an Immersion and Submersion between Manifolds

Ways to put numbered balls in boxes no box being empty

How many $8$-character passwords contain at least one digit and at least one upper case letter? [closed]

Exclusion Inclusion Principle Induction Proof

Losing at Spider Solitaire

Not divisible by $2,3$ or $5$ but divisible by $7$

inclusion-exclusion principle - challenging problem [closed]

Inclusion–exclusion principle [Proof verification]

Inclusion-exclusion principle: Number of integer solutions to equations

Proving $\sum_{k=1}^{n}{(-1)^{k+1} {{n}\choose{k}}\frac{1}{k}=H_n}$

Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions

Count permutations of $\{1,2,...,7\}$ without 4 consecutive numbers - is there a smart, elegant way to do this?

Closed form for $\left(-1\right)^{n}\sum_{k=0}^{n}\left(-1\right)^{k}\binom{n}{k}2^{\binom{k}{2}}$

Partitions and Bell numbers

Probability of complete coupon set in $K$ boxes where a box has $N$ distinct coupons?

Famous uses of the inclusion-exclusion principle?

The Matching Problem/Derangements - n letters to n people