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How to calculate combination and permutation in R?
When I try to calculate combinations in R using the Combinat package and the combn command it gives me all possible combinations. But I just want to return the number of combinations, i.e. I want to get 45 in case of 10C2. What should I do?
744
If we choose a set of r items from n types of items, where repetition is allowed and the number items we are choosing from is essentially unlimited, the number of selections possible: (n+r−1r).
Answer and Explanation: The number of possible combinations with 4 numbers without repetition is 15.
How many combinations with 5 numbers without repetition are possible? There's one (1) possible combination without repetitions C(n,r) and 126 combinations with repetitions C'(n,r) of arranging a group of five numbers (i.e., the 1-5 number list).
Use the base function choose:
choose(10,2)
#[1] 45
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