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VTMO 2013 — Grade 8 — semifinal Question 17

VTMO · VTMO 2013 — Grade 8 — semifinal

Question 17

Given $9$ divides $2 a + 7 b$, which $n$ ensures $9$ divides $5 a$+nb?
  1. $2$
  2. $3$
  3. $4$
  4. $5$
  5. $7$