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A fair coin is tossed 5 times. What is the probability of at least one head? Round to the nearest ten-thousandth.? What type of structure is a three-ring binder? If Earths atmosphere was 5x thicker would water vapor still exist in the atmosphere? 1+5+9+…+4n-3=n2n-1? How many grams of AuCl3 can be made from 250.0 grams of chlorine by this reaction: AU + Cl2 -> 2 AuCl3?