Question: In a public-key system using RSA, you intercept the ciphertext C = 20 sent to a user whose public key is e = 13, n

In a public-key system using RSA, you intercept the ciphertext C = 20 sent to a user whose public key is e = 13, n = 77.

What is the plaintext M?

Note that M has been encrypted using the public key.

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