Ahemoglobin molecule can bind 4 0, molecules. assume that e is the energy of each bound o2. relative to o2 at rest at infinite distance. let λ denote the absolute activity exp(wkbt) of the free -fin solution). a) write the partition function for this model. b) what is the probability that one and one only o2 is adsorbed on a hemoglobin molecule? c) what is the probability that three and only three o2 are adsorbed?