Archives for October 2007

Mind Bender # 11 : Hour Glass Figures

Hour GlassYou have just discovered your watch has broken, and that you only have two Hour Glasses in the house …

> one to measure 4 minutes; and

> another to measure 7 minutes.

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Mind Bender # 10 : Solution

Last month only two people managed to come up with the correct solution, as well as the reason why. Therefore, I held back their postings until now.

The answer is that you should certainly take the odds of 30:1 on offer — because your chances of winning the wager are considerably better than that.

Anyway, for those of you still puzzling over the chances of two people having their birthday on the same day in the year, in a room of 23 unrelated people … here’s how you work it out.
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