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In the order of group G= <Z20*, x>, what is the order of element 17?

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In the order of group G= <Z20*, x>, what is the order of element 17?

(a) 16

(b) 4

(c) 11

(d) 6

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Correct answer is (b) 4

The best I can explain: 17 17 9 13 1    ord(17) = 4

n? 1 2 3 4 5 6 7 order
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