Counting question based on Inclusion-Exclusion Principle
59788
Let T = {1000,1001...,9999}. How many numbers have at least one digit that is 0...
24212
proving how many permutations exist.
20221
Combinatorics - Removing Double Counted Cases
108941
Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions
101642
Counting in a rectangular grid with obstacles
117349
counting triangles in a graph or its complement
69748
Semi-Ambiguous Combinatorics Problem
6679
Counting number of subsets which contain a specific element
155372
Find the number of permutations in $S_n$ containing fixed elements in one cycle
140364
Covering ten dots on a table with ten equal-sized coins: explanation of proof
11296
The Monty Hall problem
95755
Counting the population of integers
27755
Accuracy of approximation to inclusion-exclusion formula in prime sieve
12620
A method to count occurrences in a list
73575
Number of pairs of strings satisfying the given condition
70143
Mutually exclusive countable subsets of a countable set
86263
How do we show there are the same number of elements in each of the sets?