Q:

Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = <Zn∗, ×>?

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Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = <Zn∗, ×>?


  1. 17
  2. 20
  3. 38
  4. 50

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 (b).20

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