Question 1101272
a.  (7/31)(6/30)(24/29)=0.0374
b. (7/31)(6/30)(5/29)=0.0078
c.(24/31)(23/30)(22/29)=0.4503
d.  This is 1-c or 0.9922, because at least one of the three is 1-(p that none did)