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The multiplicative Inverse of 550 mod 1769 is –

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The multiplicative Inverse of 550 mod 1769 is –

(a) 434

(b) 224

(c) 550

(d) Does not exist

I had been asked this question in an interview for job.

Question is taken from Overview in division Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

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The correct option is (a) 434

To explain I would say: The multiplicative Inverse of 550 mod 1769 is 550.

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