- Twelve people each shake hands with each other once. How many total handshakes are there?

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A volume of H gas equal to 25L was collected at 25 deg C and 1 atm pressure. what's the volume of H if it is collected at 596K and 0.50 atm? What is the vacuum of the cosmos made of? 0.1 kg cork at the end of a 0.2m string at a speed of 2m/s is twirled. what's the cork's acceleration? How do we answer questions on Venn diagrams in set theory? How to solve this worksheet?