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Историческую версию Combinatorial Calculator можно получить на Android
Простое приложение для решения комбинаторных задач (перестановки, вариации, ...)
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.