Permutation & combination is a common mathematical problems. This occurs when we want to know number of ways to select R items out of N items.
For example, In a group of 10 people, three $5 prizes will be given. How many ways the prizes can be distributed?
Combination - 10 C 3 = 10!/(3! * 7!) = 8*9*10/3*2 = 120
Permutation - 10 P 3 = 10!/7! = 720
In permutation order matters whereas order doesn't matter in combination.
Keywords for Permutation : Arrange, Line up, Order
Keywords for Combination : Choose, Select, Pick
Below is the example, number of ways to select r items from n items.
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