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12 chairs (Posted on 2010-09-14) Difficulty: 1 of 5
If 9 people are seated in a row of 12 chairs, then at least one consecutive set of 3 chairs is occupied by people.

Prove it.

See The Solution Submitted by Ady TZIDON    
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Hints/Tips re: Sparseness .....spoiler | Comment 2 of 5 |
(In reply to Sparseness by ed bottemiller)

....If any of the three E were adjacent, the set would be shorter.....

WHY?    EX: SSSSSEESSESS

Try to reword your explanation.

 


  Posted by Ady TZIDON on 2010-09-14 12:51:56
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