Combination refer to the combination of n things assumed K at a time without repetition. Although the set of three fruits was small enough to write a complete list of combinations, with large sets this becomes impractical.

COMING SOON!

```
from math import factorial
def combinations(n, k):
"""
>>> combinations(10,5)
252
>>> combinations(6,3)
20
>>> combinations(20,5)
15504
"""
return int(factorial(n) / ((factorial(k)) * (factorial(n - k))))
if __name__ == "__main__":
from doctest import testmod
testmod()
```