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A bag contains four marbles. One marble is blue, one is red, one is white, and one is yellow. Two marbles are draw from the bag by removing one marble and then, without replacing the first marble,...

The C-14 content of an ancient piece of wood was found to have three tenths of that in living trees (indicating 70% of the C-14 had decayed). How old is that piece of wood? Please use these...

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