Question 5079
This is a classic combination problem, where in this probability, the denominator is the total number of ways that 4 CD's can be chosen from 35.  One of several ways to write this is C(35,4).


The numerator is the number of ways that the fan can choose 4 out of the 6 by the artist, and none out of the other 29 CD's.  Numerator = C(6,4)* C(29,0).  These can easily be calculated with a cheap scientific calculator, or you can spend some time doing it by arithmetic:
C(35,4) = 52360
C(6,4) = 15
C(29,0) = 1


{{{  (C(6,4)* C(29,0))/(C(35,4))}}} = {{{(15*1) / 52360}}} = {{{3/ 10472}}}


R^2 at SCC