algorithm - What is the professional term for the combination of the selection in n out of the total m elements? -


i know number of combinations called ncr, exact outcomes?

for example: have 3 elements a,b,c , param 2, have outcomes ab ac ba bc ca cb

i want search different implementations of this. don't know term should input in google.

just realized question wrong.

you speaking combinations yet expecting results "ab" , "ba". basic property of combinations fact unordered, is, set {a, b, c}, 2-combinations {ab}, {ac}, {bc}, nothing else.

the term looking variation or partial permutation. variations, order of elements matters.


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