下载 APKPure App
可在安卓获取Combinatorial Calculator的历史版本
用于解决组合问题的简单应用程序（排列、变化等）
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.