Question

How many numbers must be selected from the set
{1, 3, 5, 7, 9, 11, 13, 15} to guarantee that at least one pair
of these numbers add up to 16?

Answer 1

There are 4 pair of numbers that add up to 16. So you would need to choose at least 5 numbers to ensure that you got at least one of those pairs.

Answer 2

thank you!