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+//chapter 31 Ex 7
+
+clc;
+clear;
+close;
+totalCards=52; random=2; Black=26; queen=4;
+sizeS= factorial(totalCards)/(factorial(totalCards-random)*factorial(random));
+sizeE1=(factorial(Black)/(factorial(Black-random)*factorial(random)));
+sizeE2=(factorial(queen)/(factorial(queen-random)*factorial(random)));
+prob1=sizeE1/sizeS;
+prob2=sizeE2/sizeS;
+probBoth=prob1*prob2;
+
+probTotal=prob1+prob2-probBoth;
+printf("The probability that either both cards are black or both are queen is %0.3f",probTotal);