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If 5 cards are drawn from a deck, find the probability that 2 will be hearts.? Yahoo hasn't been updating category leader boards for about a month..Have they permanently quit doing that? The temperature of a gas is 273K to 275K and the pressure increases are kept constant. How to change the volume? According to the scientific study can plants feel pain? What formula would I use to find the sum of 3(-2)^n from n=2 to n=8?