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ᶲ(440)=(a) 200(b) 180(c) 160(d) 220I have been asked this question in my homework.The above asked question is from Number Theory in portion More Number Theory of Cryptograph & Network Security

Answer»

Correct choice is (c) 160

Explanation: ᶲ(440) = ᶲ(2^3) X ᶲ(5) x ᶲ(11) = (2^3 – 2^2) x 4 x 10 = 160.



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