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SASMO 2016 Primary 4 (Grade 4) Contest Question 5

SASMO · SASMO 2016 Primary 4 (Grade 4) Contest

Question 5

Find the next number in the sequence $4,9,19,39,79,\ldots$.

Question illustration
  1. 99
  2. 119
  3. 134
  4. 139
  5. 159