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davetang/comb_with_replacement.R

Created September 9, 2013 02:43
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Calculate the number of combinations with replacement
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comb_with_replacement.R
comb_with_replacement <- function(n, r){
return( factorial(n + r - 1) / (factorial(r) * factorial(n - 1)) )
}
#have 3 elements, choosing 3
comb_with_replacement(3,3)
#[1] 10
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