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WAEC Mathematics 2018 Question 37

Question 37

Modular Arithmetic

If 3x ≡ 4 (mod 5) find the least value of x.

  1. A.1
  2. B.2
  3. C.3
  4. D.4
Show the answer and explanation

Answer: C (3)

Explanation

Try values: 3 × 3 = 9 ≡ 4 (mod 5), so x = 3.