Fugacity for Example Non-Ideal Gas

For a gas which obeys the equation of state V = RT/P + b + cP (per mole), the activity coefficient is given by = e^{(2bP + cP2)/2RT} (Equation 5-22, page 144, Dykstra's Physical Chemistry, A Modern Introduction)
with b > 0 and c > 0. Then f is always less than or equal to P f is always greater than or equal to P f is sometimes greater than and sometimes less than P the relation between f and P can not be determined

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