Q4. math pigeonhole2 From the set of numbers s={1, 2, 3, 4}, how many minimum numbers must be selected to guarantee that at least one pair of these numbers has a sum equal to 7?

#1

why the answer is not 4 because if we pick 4 numbers from the give set that means we are picking all the 4 numbers so we always pick 3 and 4 which sum up to 7 which is the required sum