APKPure Appを使用する
Combinatorial Calculatorの旧いバージョンをダウンロードすることが可能
組み合わせ問題（順列、バリエーション、...）を解決するためのシンプルなアプリ
This is the perfect app for solving school problems. Compute factorial of n to solve permutations problem. Show permutations and find their ranks. Find how many ways there are to make a group of 3 out of 12 students (combinations). Find all variations for the safe password (variations) and many more.