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For two positive integers a and b define the function h(a,b) as the greatest common factor (G.C.F) of a, b. Let A be a set of n positive integers. G(A), the G.C.F of the elements of set A is computed by repeatedly using the function h. The minimum number of times h is required to be used to compute G is

  1. $\frac{1}{2} \: n$
  2. $(n-1)$
  3. $n$
  4. None of these

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