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How many numbers must be selected from the set {1, 2,3,4,5,6}to guarantee that at least one pair of these numbers add up to 7

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Answer:

2

Explanation:

Not one number adds up to 7. So, 6 + 1 = 7, and 4 + 3 = 7, and 5 + 2 = 7.

User Epsilon Prime
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