Math pigeonhole 2 quiz

#1

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?

Ans given=5

here we only have 4 numbers in the set so how is the answer 5?

#2

Hello @bishal_c

answer is 4. we will select {1,2,3,4} to ensure that atleast one pair has sum 7

#3

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