Consider a three-state model for Helix-coil transition h, c, and i write expression for partition function?

Consider a three-state model for Helix-coil transition h:helix,coil:c, and intermediate:i. Assume the model is non-cooperative. write expression for partition function of such a chain.

Consider a three-state model for Helix-coil transition h, c, and i write expression for partition function?
h= (C*I/A+T/k)*z*log(.7*y)
Reply:h= (C*I/A+T/k)(.7*y)