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d1 or more ? (Posted on 2016-03-07) Difficulty: 1 of 5
A problem from the 2004 Harvard-MIT Math Tournament:

Zach chooses five numbers from the set {1, 2, 3, 4, 5, 6, 7} and tells their product to Claudia. She finds that this is not enough information to tell whether the sum of Zach’s numbers is even or odd. What is the product that Zach tells Claudia?

I believe it is a d1 puzzle.

Are you on my side?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Hints/Tipsre: Why I'm with AdyAdy TZIDON2016-03-07 12:08:41
SolutionWhy I'm with AdyJer2016-03-07 10:47:25
SolutionMy AnalysisBrian Smith2016-03-07 10:20:44
Some ThoughtsthoughtsCharlie2016-03-07 09:49:56
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