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In 15 experiments studying the electrical behavior of


In 15 experiments studying the electrical behavior of single cells, 11 use microelectrodes made of metal and the other 4 use microelectrodes made from glass tubing. If two of the experiments are to be terminated for financial reasons, and they are selected at random, what are the probabilities that

  1. neither uses the microelectrodes made from glass tubing?
  2. Only one uses the microelectrodes made from glass tubing?
  3. Both use the microelectrodes made from glass tubing?

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