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

Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = ? Correct Answer 20

The group G = has primitive roots only if n is 2, 4, pt, or 2pt ‘p’ is an odd prime and‘t’ is an integer. G = has primitive roots, 17 is a prime. G = has no primitive roots. G = has primitive roots, 38 = 2 × 19 prime. G = has primitive roots, 50 = 2 × 52 and 5 is a prime.
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Related Questions

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