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Find a number ‘a’ between 0 and 9such that ‘a’ is congruent to 7^1000 mod 10.(a) 2(b) 1(c) 3(d) 4This question was posed to me in my homework.The question is from Number Theory topic in portion More Number Theory of Cryptograph & Network Security

Answer»

Correct answer is (b) 1

To EXPLAIN: Use EULERS THEORUM.



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