Combinatorial calculator

Find out how many different ways you can choose k items from n items set. With/without repetition, with/without order.

(n)
(k)

Calculation:

Ck(n)=(nk)=n!k!(nk)!  n=10 k=4  C4(10)=(104)=10!4!(104)!=109874321=210

Number of combinations: 210