Problem 1 · 2019 Math Kangaroo
Easy
Number Theory
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Answer: E — Cloud E.
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Hint 1 of 2
A number is even when its last digit is 0, 2, 4, 6 or 8.
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Hint 2 of 2
Scan each cloud and reject it the moment you spot a single odd number.
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Approach: check each option for an odd number
- Go cloud by cloud and look for any odd value.
- Clouds A through D each contain at least one odd number (for example a 3, 5, 9 or 27).
- Only cloud E (10, 2, 34, 58) has every number ending in an even digit.
- So the answer is E.
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