Choose the odd number: Among 15, 27, 37, and 39, three are multiples of 3 while one is not. Identify the non-multiple of 3.
Verbal Reasoning
Classification
Difficulty: Easy
Choose an option
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A15
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B27
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C37
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D39
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ENone of these
Answer
Correct Answer: 37
Explanation
Introduction / Context:This set separates multiples of 3 from a single non-multiple, which is the odd item.
Given Data / Assumptions:
- Numbers: 15, 27, 37, 39.
- Divisibility-by-3 via digit-sum rule.
Concept / Approach:Apply the digit-sum rule quickly, then confirm the outlier.
Step-by-Step Solution:
15 → 1 + 5 = 6 → multiple of 3.27 → 2 + 7 = 9 → multiple of 3.39 → 3 + 9 = 12 → multiple of 3.37 → 3 + 7 = 10 → not a multiple of 3.Verification / Alternative check:37 is prime; 15, 27, and 39 are all divisible by 3 directly.
Why Other Options Are Wrong:They are consistent multiples of 3.
Common Pitfalls:Assuming “ends with 7” implies special divisibility; use the proper rule.
Final Answer:37 is not divisible by 3 and is the odd number.