clear//

//Variables

R1=20.0*10**3;R2=20.0*10**3;R=20.0*10**3;
C1=100.0*10**-12;C2=100.0*10**-12;C=100.0*10**-12;

//Calculation

f = 1/(1.38 * R * C)                    //Frequency (in Hertz) 

//Result

printf("\n Frequency of oscillation is  %0.0f  kHz.",f * 10**-3)