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...at once :D? sitting in chemistry today looking at the periodic table made me wonder the multitudee of reactions that couldoccur between every element of the periodic table if they were mixed together at once. Also the number of reactions that would come about due to the products produced by...

Ok, i have a few questions, 1-) "if there are 3 rooms in a dormitory, a single, a double, and a quad. How many ways are there to assign 7 people to the rooms?" well i thought that it would just be 7*6*4, but i'm not sure, if someone could confirm this that would be awesome :D ok second question...