Ahemoglobin molecule can bind 4 o2molecules. assume that e is the energy of each bound o2 relative to o, at rest at infinite distance. let λ denote the absolute activity exp(u/kt) of the free o2 (in solution). a) write the partition function for this odel. b) what is the probability that one and one only o is adsorbed on a hemoglobin molecule? c) what is tbe probability that three and only three o are adsorbed?