https://cienciaprogramada.com/tags/counting/ Recent content in counting on Ciência Programada Hugo -- gohugo.io en contato[@]cienciaprogramada.com.br (Francisco Bustamante) contato[@]cienciaprogramada.com.br (Francisco Bustamante) © 2026 Francisco Bustamante Tue, 30 Jun 2026 00:00:00 +0000 https://cienciaprogramada.com/2026/06/sum-and-product-rules/ Tue, 30 Jun 2026 00:00:00 +0000 contato[@]cienciaprogramada.com.br (Francisco Bustamante) https://cienciaprogramada.com/2026/06/sum-and-product-rules/ With 4 math books and 3 Portuguese books, there are 7 ways to pick one book and 12 ways to pick one of each. The first count is a sum and the second is a product: these are the sum rule and the product rule, applied here to passwords, flags, answer keys, and counting divisors. https://cienciaprogramada.com/2026/06/the-art-of-counting/ Mon, 29 Jun 2026 00:00:00 +0000 contato[@]cienciaprogramada.com.br (Francisco Bustamante) https://cienciaprogramada.com/2026/06/the-art-of-counting/ How many 8-character passwords are there? In how many ways can 10 people sit around a table? Combinatorics answers without listing every case. This is the roadmap of the series: from the counting rules to permutations, arrangements, combinations and the binomial theorem.