下載 APKPure App
可在安卓獲取Combinatorial Calculator的歷史版本
用於解決組合問題的簡單應用程序（排列、變化等）
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.