Free Practice Question
PS · Problem Solving
705-805
Combinations
The International Group (IG) conference has just begun. This year, IG is hosting 4 distinguished speakers. Attendees can choose to sit in on or skip each lecture. How many minimum number of attendees would need to come to IG to guarantee that, at the end of the conference, at least two attendees will have sat in on and skipped exactly the same lectures all through the 4 speakers?
Answer Choices
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5
B
8
C
9
D
17
E
20
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Explanation
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Difficulty
705-805
Type
PS
Category