How many numbers must be selected from the set {1, 2, 3, 4} to guaran – McqOptions

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1.	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 to 7?
A.	14
B.	5
C.	9
D.	24
Answer» C. 9

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