Doubt in finding pairs

#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?

sir in this set I find only one pair {3,4} whose at least one pair of these numbers has a sum equal to 7.
so in my idea minimum numbers selected are 3,4 that is 2 elements

#2

no you have two gaurantee that the pair sum is atleast 7 , if your ans is 2 thats wrong coz what if 1 one and 1 two are there @Ankit_kumar_3003
i hope its cleared if yes dont forget to mark resolved and hit like :smiley: