Question 932397
You need to poll 16 people and here is why:


If you polled 15 people, then the worst case scenario is that each person has a different number from the rest (person A has 1 card, person B has 2 cards, etc). That extra 16th person will have a number of cards from 1 to 15.


So again, you need to poll 16 people to guarantee that at least 2 of them will have the same number of cards.


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