Combinations with repetition

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)=(n+k1k)  n=11 k=3  C3(11)=C3(11+31)=C3(13)=(133)=13!3!(133)!=131211321=286

Number of combinations with repetition: 286