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9. Let : N 7 N 7 be defined by ( x ) = (4 x + 3) mod 7. a. (Fill in the blank.)

9. Let : N7 N7 be defined by

(x) = (4x + 3) mod 7.

a. (Fill in the blank.) is a bijection because gcd( , ) = 1.

Answer:

b. Find a formula for 1, the inverse of .

Answer:

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