During the study, patients have relapses of the fever at an instantaneous rate of 1.85% per month. What is the probability that a given patient
a) will have a relapse within the three months needed for the study of Pande's treatment?
b) will have a relapse sometime in the second six months?
c) will have no relapse in the first 6 months?
d) will have a relapse in the seond year, knowing that no relapse occured in the first year?