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diff --git a/3446/CH24/EX24.2/Ex_D2.sce b/3446/CH24/EX24.2/Ex_D2.sce
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+// Exa D.2
+// what is the location of the modulo-2 adder for the second m-sequence? Generate the second m-sequence.
+
+clc;
+clear all;
+
+//solution
+disp("The location of modulo-2 adder for the second m-sequence is shown in Figure D.5(in the book)i.e Modulo-2 adder should be between first(x1) and second(x2) shift register.");
+x=[0 0 1]; //Initial stage
+output=x(3);
+disp("Second m-sequence usinf 3-stage register");
+disp("           x1 x2 x3         output");
+printf(' Initial    %d  %d  %d           %d \n ',x(1),x(2),x(3),output);
+for i= 1:7
+    printf('Shift %d',i);
+    x(3)=x(2);
+    if(x(3)==1) //TO get values in range of [-1 1] for plot
+    dummy(i)=-1
+else
+    dummy(i)=1;
+    end
+    x(2)=x(1);
+   if(output== 1& x(2)==1) //As new x(1)=prev stage x(3) ored                                   prev stage x(2)
+       x(1)=0;
+   else
+       if(output== 0& x(2)==0)
+           x(1)=0;
+       else
+           x(1)=1;
+       end
+   end
+   
+    printf('    %d  %d  %d ',x(1),x(2),x(3));
+     output=x(3);
+     printf('          %d',output);
+      printf('\n ');
+end
+figure(1);
+bar(dummy,0.2,'green');
+xlabel("Time","FontSize",5);
+title("7-chip second m-sequence for one T period","FontSize",5);
+disp("The properties of m-sequence in Figure(1)are -");
+disp("Number of -1s = 4 , Number of 1s = 3 ");
+disp("Run length 1 = 2 , Run length 2 = 1");
+disp("Run length  = 1");
+