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Heat absorbed by an ideal gas in a cycle

1. Homework Statement
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2. Homework Equations and the attempt at a solution:
AC is adiabatic and AB is isothermal.

Heat absorbed during process AC = 0 (adiabatic).
Heat absorbed during process CB = [tex] C_p \triangle T=-\frac{\gamma}{\gamma -1} (P_2V_3 - P_2V_2) [/tex]
Heat absorbed during process BA = [tex] RT\ln \frac{V_3}{V_1} [/tex]

Summing it up, does not give any of the options. What went wrong?
 

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