Question 218462
Prime products:
1*1*1*1=1
1*1*1*3=3
1*1*1*5=5
1*1*3*1=3
1*1*5*1=5
1*3*1*1=3
1*5*1*1=5
3*1*1*1=3
5*1*1*1=5
Probability = (number of successes)/(total outcomes).
9/6^4=9/1,296=1/144 ans.
A sample space diagram could also be used here but I don't have much success in creating one.