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

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

Post by answerhappygod »

a) 14
b) 5
c) 9
d) 24
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