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Let us define an interval $A(n)$ as a function of $n$ as $A(n)=(-1 / n, 1 / n)$. Then the set of points that lie in the intersection of $A_{n}{ }^{\prime} s, n=1, \ldots, \infty$

  1. is an interval
  2. is a single point
  3. is an empty set
  4. cannot be determined
  5. has two disjoint intervals
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