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JD's Twelve Coin puzzle reminds me of a box I built many years ago
consisting of a Red LED, two D-cells and three rotary SPST on-off
switches - all wired in series.
The 'puzzle' is to 'flip' the switches enough to make the LED turn
The REAL assignment is to figure out and write down an algorithm that
will guarantee that the light will light in a minimal number of
The candidates were blindfolded and three white caps were placed on
their heads. The blindfolds were removed. All the three raised hands.
Presently one of them said that his cap is white. How did he guess that?