Question

Let a= {1, 2, 3, 4, 5, 6, 7, 8}
a.If five integers selected from a, must at least one pair of integer have a sum of 9?
b.If four integers selected from a, must at least one pair of integer have a sum of 9?

Answer 1

Answer:

5+4, 6+3, 8+1, 7+2

Step-by-step explanation:

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