When the order of the elements chosen from the set is not impotrant, we call this a
combination. Putting it differently, the combinations are subsets of a given set.
We have kinds of fruit. How many deifferent kinds of fruit salads with kinds of fruits can we make?
We have a certain number of different elements, , and the number of place, , in which the spaced elements, but the order of elements isn't important. The allocation of elements on place are variation. In doing so too often considered the allocation of the same elements at different place. The arrangement elements on place is . With this number divided number of variations to obtain the number of combinations. The form is:
This type of selection is also known as combinations without repetition.
THINK ABOUT IT:
How are combinations different from the variations?