The oldest open clusters are   a. 3 to 4 billion years old.   b. 6 to 7 billion years old.   c. 9 to 10 billion years old.   d. 12 to 13 billion years old.   e. 16 to 17 billion years old.

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  1. The oldest open clusters are
      a.
    3 to 4 billion years old.
      b.
    6 to 7 billion years old.
      c.
    9 to 10 billion years old.
      d.
    12 to 13 billion years old.
      e.
    16 to 17 billion years old.
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