Ponder This

June 2010

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Ponder This Challenge:

The following circuit computes a known Boolean function; but it contains a single gate error.

View the circuit image

What is the function? Which gate is wrong, and what should it be? Pay attention to the inverters (the small hollow circles on the right end of some of the gates)

Update: June 3rd: The bundle of wires on the right side is not a mistake - this circuit has several Boolean outputs.

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Challenge: 06/01/2010 @ 1:17 PM EST
Solution: 07/01/2010 @ 1:17 PM EST
List Updated: 06/08/2010 @ 5:52 PM EST

People who answered correctly:

Michael Brand (06/01/2010 10:19 PM EDT)
Ian Barnard (06/03/2010 04:56 AM EDT)
Matthew Paterson (06/03/2010 09:07 AM EDT)
Dmitry Litvinenko (06/04/2010 01:09 AM EDT)
Ben Holland (06/04/2010 03:54 PM EDT)
Ross Millikan (06/04/2010 05:52 PM EDT)
Phil Muhm (06/06/2010 11:30 AM EDT)
Guler Amos (06/06/2010 12:39 PM EDT)
Patrick Fussell (06/06/2010 05:47 PM EDT)
Andreas Stiller (06/06/2010 11:05 PM EDT)
Daniel Bitin (06/07/2010 09:55 AM EDT)
Thomas Rohr (06/08/2010 08:31 AM EDT)
Hubert Kahlert (06/08/2010 10:39 AM EDT)
John T. Robinson (06/09/2010 02:39 AM EDT)
Suman Saraf (06/09/2010 05:02 PM EDT)
Sharad Agrawal (06/10/2010 03:55 AM EDT)
Beni Bachmann (06/10/2010 06:40 AM EDT)
Matthias Graefenhan (06/10/2010 11:07 AM EDT)
Mark Mixer (06/10/2010 08:28 PM EDT)
William Heller (06/10/2010 10:27 PM EDT)
Sai Krishna Komaravelli (06/13/2010 05:27 AM EDT)
Kai Guttmann (06/14/2010 07:30 PM EDT)
Don Ryan (06/15/2010 01:51 AM EDT)
AthenaHealth Problem Solving Group (06/15/2010 02:21 PM EDT)
Rani Hod (06/16/2010 10:58 AM EDT)
Maheedhar Jalasutram (06/17/2010 02:27 PM EDT)
Fabio Filatrella & Luca Bottoglia (06/18/2010 12:30 PM EDT)
S. Gunasekaran (06/19/2010 06:12 AM EDT)
Raúl Mora Pastor (06/19/2010 11:56 AM EDT)
John Duffield (06/22/2010 06:03 AM EDT)
Chuck Carroll (06/22/2010 01:30 PM EDT)
Rajendran Thirupugalsamy (06/23/2010 03:19 AM EDT)
Dmitry Teytelman & Leo Broukhis (06/23/2010 02:14 PM EDT)
Srivani Narra (06/24/2010 01:06 PM EDT)
Albert Stadler (06/25/2010 01:25 PM EDT)
Motty Porat (06/25/2010 01:40 PM EDT)
Joseph DeVincentis (06/28/2010 11:51 AM EDT)
Michael D Moffitt (06/30/2010 04:40 PM EDT)

Attention: If your name is posted here and you wish it removed please send email to the ponder@il.ibm.com.