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+clc;
+//page no 89
+// prob no 2.10
+// refer fig 2.40
+P=10;f_ref=10*10^3;M=10;
+//consider 
+N=1;
+// With a fixed-modulus prescalar, the min freq step is 
+step_size=M*f_ref;
+// With the two-modulus system, let the main divider modulus N remain constant & increase the modulus m to (m+1) to find how much the freq changes.
+// for 1st case, o/p freq 
+fo=(M+N*P)*f_ref;
+// for 2nd case where leave N alone but changes M to M+1, new o/p freq 
+fo_=(M+1+N*P)*f_ref;
+// The difference is 
+f= fo_-fo;
+disp('Hz',f,'The step size that would have been obtained without prescaling');
+\ No newline at end of file