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SASMO 2018 Secondary 2 (Grade 8) Contest Question 23

SASMO · SASMO 2018 Secondary 2 (Grade 8) Contest

Question 23

What is the least number of integers that must be randomly selected from
1, 2, 3, ..., 50 to ensure that there will be two numbers (among selected) such
that one of them is twice the other?
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Question illustration