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+//Example 1.21 A batch contains 10 articles of which 4 are defective .
+clc;
+clear;
+N=120;
+disp(N,"total no. of ways in which 3 articles are selected out of 10  =");
+M= 20;
+disp(M,"No. of favourable cases are  ");
+P=M/N;
+disp(,P,"Probability that 3 articles are chosen at random and none is defective = ");