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VTMO 2014 — Grade 7 — semifinal Question 3

VTMO · VTMO 2014 — Grade 7 — semifinal

Question 3

$a \equiv 1 , b \equiv 2$ modulo $8$. Find the remainder of $9 a + 3 b$.
  1. $1$
  2. $3$
  3. $5$
  4. $6$
  5. $7$