A group consists of 5 men and 8 women. 4 people are selected to attend a conference. a. In how many ways can 4 people be selected from this group of ​13?
b. In how many ways can 4 women be selected from the 8 ​women?
c. Find the probability that the selected group will consist of all women.

a. The number of ways to select 4 people from the group of 13 is ___.

b. The number of ways to select 4 women from the group of 8 women is ___.

c. The probability is ___.
​(Type an integer or a simplified​ fraction.)