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| The Answer is 9 or 10? | |
| 作者单位： | 华中师范大学数学与统计学学院 |
| 摘 要： | Below is Problem 9 in Singapore MathematicalOlympiad 2001:Five people jointly bought a lottery ticketwhich won the first prize.They decided to keeptheir ticket in a locker installed with a number oflocks.Each person may hold the keys to more thanone lock.What is the minimum number of locks nee-ded to serve the purpose that any 3 together will beable to open the locker but any 2 of them togetherwill not be able to open it ?A.6 B.9 C.10 D.12 |
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