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+//Example 1.31 10 dissimilar balls are distributed at random into 4 boxes ar marked A B C D
+clc;
+clear;
+N=4^10;
+disp(N,"total no. of possible ways of distribution =");
+M= (factorial(10)/(factorial(2)*factorial(4)*factorial(4)*factorial(0)));
+disp(M,"No. of favourable cases such that 4 boxes contain respectively 2,4,4,0 balls =");
+P=M/N;
+disp(P," The required Probability is = ");