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There are 5 dessert courses. They will be presented 2 at a time in an order. How many different arrangement are there? What is the difference between an abdominal fistula and an abdominal sebaceous cyst? What's the balanced reaction of Solid sodium and chlorine gas are formed by the decomposition of solid sodium chloride? Thanks a lot!!!1? Why does yeast produce more foam with sugar than with maple syrup? If X,Y are symmetric random variables,show that E(X/X+Y)=1/2?