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av=-40;
k1=0.1;
k2=0.2;
k3=-0.01;
disp("Part a");
a1=av/(1-k1*av);
disp("the overall voltage gain with 10 % negative feedback is"); disp(a1);
disp("Part b");
a2=av/(1-k2*av);
disp("the overall voltage gain with 20 % negative feedback is"); disp(a2);
disp("Part c");
a3=av/(1-k3*av);
disp("the overall voltage gain with 1 % positive feedback is"); disp(a3);
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