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+white_balls= 6;
+black_balls = 5;
+total = white_balls + black_balls;
+probability_whiteandblack = white_balls*black_balls/(total*(total-1));
+probability_blackandwhite = white_balls*black_balls/(total*(total-1));
+reqd_probability = probability_whiteandblack + probability_blackandwhite;
+disp(reqd_probability, "Thus, the required probability is") \ No newline at end of file