What is the partition function- calculate the internal

Question

A system consists of NA distinguishable, independent particles, each of which is capable of existing in only two non degenerate energy states 0 and ?.

(a) What is the partition function?

(b) Calculate the internal energy.

(c) Calculate C_v

_{(d) Plot cv/R as a function of kT/? from kT/? = 0 to 1.}