Hello

I was wondering if someone could help me.

I am currently working on a problem and don't know where to start. I have a question as follows:

There are 20 students, 16 are fulltime students considered for an advertised position. Initially 4 have been short-listed for an interview. If 3 are selected at random and X is the no of part-time students, calculate

pX(x) for all x?

what does this mean? is it binomial distribution???i'm lost!