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Find the order of group G= (a) 6(b) 9(c) 10(d) 8I got this question during an online interview.The doubt is from Number Theory in chapter More Number Theory of Cryptograph & Network Security

Answer»

The correct answer is (d) 8

Easy explanation: |G| = f(20) = f(4) × f(5) = f(22) × f(5) = (22-21)(51-50) = 8.

G = = { 1, 3, 7, 9, 11, 13, 17, 19 }.



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