An ideal gas with the adiabatic exponent goes through a direct (clockwise) cycle consisting of adiabatic, isobaric,

An ideal gas with the adiabatic exponent γ goes through a direct (clockwise) cycle consisting of adiabatic, isobaric, and isochoric lines. Find the efficiency of the cycle if in the adiabatic process the volume of the ideal gas.
(a) Increases n-fold;
(b) Decreases n-fold.