Question

The number of combinations of elements taken at a time is given by ________.
Fill in the blanks.

Answer 1

Answer:

The number of combinations of n objects taken r at a time is determined by the following formula:

$C(n,r)=\frac{n!}{(n-r)!r!}$

where n is the number of things to choose from, and we choose r of them, no repetition, order doesn't matter.