1. Is the affine cipher e(x) = 15x + 11 (mod 75) invertible? Yes or no. If yes, find the inverse (fully reduced with positive terms modulo the modulus), if no, explain why. = 2. Is the affine cipher e(x) = 16x +11 (modI75) invertible? Yes or no. If yes, find the inverse (fully reduced with positive terms modulo the modulus) if no, explain why.

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