Each time a system requests memory, the operating system allocates one or more webpage frames to the method and maps the method’s sensible internet pages to the physical webpage frames. P R = V two × I = V R R + R C × V R + R C = R R + R C × V 2 R + R C = R R + R C P V displaystyle P_ R =V_ two periods I=V frac R R+R_ C moments frac V R+R_