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VTMO 2015 — Grade 5 — semifinal Question 5

VTMO · VTMO 2015 — Grade 5 — semifinal

Question 5

Define $a\otimes b=a\times b+a+b$; for example $8\otimes5=53$. Find $9\otimes3$.
  1. $36$
  2. $39$
  3. $42$
  4. $45$
  5. $48$