and (mod 18), calculate (17)(49°. (496 –76+1) (mod 19)
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- In the congruences ax b (mod n) in Exercises 40-53, a and n may not be relatively prime. Use the results in Exercises 38 and 39 to determine whether these are solutions. If there are, find d incongruent solutions modulo n. 42x + 67 23 (mod 74)30. Prove that any positive integer is congruent to its units digit modulo .