1. The problem statement, all variables and given/known data Suppose we roll a fair die. Whatever number comes up, we toss a coin that many times. What is the probability mass function of the number of heads? 2. Relevant equations N/A 3. The attempt at a solution Let X=number of heads Then I know that X can take on the values 0,1,2,3,4,5,6. How to proceed from here I have no clue... Could someone please explain? Any help would be appreciated!