Arrangcombine

Arrange and Combine Calculator
A comprehensive iOS application for calculating permutations and combinations, with advanced features and beautiful UI design.
feature
-**Basic calculation * *: For any given value of n and r, calculate P (n, r) and C (n, r)
-**Visual representation: Display all possible arranged tree diagrams and lists
-**Custom element * *: Input specific elements to generate real arrangement/combination instances
-**Duplicate support * *: Handling permutations and combinations with duplicate elements