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diff --git a/462/CH2/EX2.27.a/ex_2_27_a.pdf b/462/CH2/EX2.27.a/ex_2_27_a.pdf
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diff --git a/462/CH2/EX2.27.a/ex_2_27_a.sce b/462/CH2/EX2.27.a/ex_2_27_a.sce
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+//example 2.27 (a)//
+//subtraction of octal numbers//
+clc
+//clears the screen//
+clear
+//clears already existing variables//
+x=oct2dec('53')
+//octal to decimal conversion//
+y=oct2dec('37')
+z=x-y
+//subtraction//
+a=dec2oct(z)
+//decimal to octal conversion//
+b=dec2bin(z)
+//decimal to binary conversion//
+disp('result of subtraction of given numbers in octal form is:')
+disp(a)
+//answer in octal form//
+disp('result of subtraction of given numbers in binary form is:')
+disp(b)
+//answer in binary form//
+\ No newline at end of file