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How many numbers cannot be used in GF(p) in 2n where n=4?(a) 2(b) 5(c) 3(d) 1I had been asked this question in an international level competition.Enquiry is from Polynomial and Modular Arithmetic- I in division Basic Concepts in Number Theory and Finite Fields of Cryptograph & Network Security

Answer»

The correct choice is (C) 3

The BEST I can explain: If n=4, the LARGEST prime less than 24 is 13. This means that we cannot use the integers 13, 14 and 15.



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