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BBB 2021 - Primary 6 - Preliminary Round Question 6

BBB · BBB 2021 - Primary 6 - Preliminary Round

Question 6

If $4\otimes2=4\times5$, $4\otimes5=4\times5\times6\times7\times8$. Find the value of $6\otimes5$.

Editorial interpretation: $a\otimes b$ is the product of $b$ consecutive integers beginning at $a$. The examples suggest this rule but do not uniquely define an arbitrary operation. The grading answer is conditional on this intended rule.
  1. 6720
  2. 67200
  3. 30240
  4. 3024