Question 1095711
There are {{{25*24*23/(2*3)}}} possible groups of 3 people that can be formed from the 25 people available.
Of those, {{{15*14*13/(2*3)}}} are made of 3 women,
because that is the number of groups of 3 women that you can form from the 15 women available.
The groups made of 3 women, as a fraction of all the groups of 3 people, are
{{{15*14*13/(25*24*23)=3*7*13/(5*12*23)=7*13/5*4*23)=91/460}}} .
That is the probability that all three people are women.