In a certain code, 5 is written as 25 and 6 is written as 36. What is 9 written as?
Correct answer: B. 81
- A. 18
- B. 81
- C. 90
- D. 99
Explanation
Each number is squared, since 5 squared is 25 and 6 squared is 36, so 9 becomes 81. Doubling would give 18, which is the trap in the first option. Always test a rule against every example given rather than only the first.
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