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diff --git a/462/CH2/EX2.21/ex_2_21.sce b/462/CH2/EX2.21/ex_2_21.sce
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+//example 2.21//
+clc
+//clears the screen//
+clear
+//clears already existing variables//
+x=247
+//decimal to octal conversion//
+a=dec2oct(x)
+disp('the octal conversion of given no is:')
+disp(a)
+//answer in octal form//
+\ No newline at end of file