//example1.11
clc
disp("Redrawing the circuit,")
disp("R1 and R2 are in series from fig. 1.59(b)")
r=150/25
disp(r,"R1(in ohm)=(15*10)/(15+10)=")
r=24/10
disp(r,"R2(in ohm)=(6*4)/(6+4)=")
disp("then, R_ab=R1+R2")
r=6+2.4
disp(r,"Therefore, R_ab(in ohm)=6+2.4=")