Hey guys!

I need some help and hopefully you can help me! And my apologies for not using latex - I am a total noob with it! My problem is:

A simple random sample of sizen = 3is selected with replacement from a population of sizeN = 10whose mean and variance areYbar = 26andS^2 = 39.

a) Find the probabilities that the sample contains2and3distinct unitsrespectively.

And I have been given the hint that the probability that the sample contains1 distinct unit is p_1=1/(N^2) =0.01

Okay, for starts, regarding the hint, how was the p_1 derived? and how do we approach such a question? I don't want answers, but I really need guidance from someone out there as to where to start on this because I am really struggling at the moment! Thanks for your help in advance!