Dan Posted June 29, 2009 Report Share Posted June 29, 2009 This is a mathematical challenge, and it's been said that: If you're an engineer (or machinist), you should be able to solve it in (under) three minutes, If you're an architect, in three hours;? If you're a doctor, in six hours;? If you're an accountant, in three months and? If you're a lawyer, probably never. If you're good at math or logical problems, solve this challenge!! What is the missing number in this logical series?? 1, 2, 6, 42, 1806, __________??? How long did it take you to find the answer? Quote Link to comment Share on other sites More sharing options...
Don in Upstate NY Posted June 29, 2009 Report Share Posted June 29, 2009 3263442. Under two minutes. Yep, I was an engineer in a previous life. Quote Link to comment Share on other sites More sharing options...
JohnH Posted June 29, 2009 Report Share Posted June 29, 2009 Same answer here - 3263442 (but not an engineer) The progression was a dead giveaway that multiplication was involved. Quote Link to comment Share on other sites More sharing options...
rfassett Posted June 29, 2009 Report Share Posted June 29, 2009 Me too - 3,263,442 in less than a minute. I am not an engineer but have a niece and a nephew that are. Quote Link to comment Share on other sites More sharing options...
bstaxes Posted June 29, 2009 Report Share Posted June 29, 2009 3263442 under a minute. I not an engineer either. No engineers in the family. My claim to fame a math teacher. Oh well could be worst. Quote Link to comment Share on other sites More sharing options...
mcb39 Posted June 29, 2009 Report Share Posted June 29, 2009 I only figured it out after three "brains" told me how.... :scratch_head: Quote Link to comment Share on other sites More sharing options...
Jack from Ohio Posted June 29, 2009 Report Share Posted June 29, 2009 3,263,442 in under 1 minute. I was not an engineer, but have always been technically, scientifically and mechanically minded. Math was one of my favorite things. If anyone wants to know the progression, send me a message. I won't post it. Quote Link to comment Share on other sites More sharing options...
Gail in Virginia Posted June 29, 2009 Report Share Posted June 29, 2009 I got it very quickly also - but thanks for not posting the progression before I had a chance to see it. Very nice puzzle. Quote Link to comment Share on other sites More sharing options...
Margaret CPA in OH Posted June 29, 2009 Report Share Posted June 29, 2009 35 seconds - a musician and former molecular biologist but a wannabe engineer Quote Link to comment Share on other sites More sharing options...
BulldogTom Posted June 29, 2009 Report Share Posted June 29, 2009 I got it in under a minute. pretty simple actually. Not an engineer, just a taxman. Tom Lodi, CA Quote Link to comment Share on other sites More sharing options...
L.S. Posted June 29, 2009 Report Share Posted June 29, 2009 I got it in under a minute. pretty simple actually. Not an engineer, just a taxman. Tom Lodi, CA Have any of you guys tried the puzzles MathDoku? I got addicted this past weekend! http://www.mathdoku.com/ Quote Link to comment Share on other sites More sharing options...
Tax Prep by Deb Posted June 29, 2009 Report Share Posted June 29, 2009 It took me about two minutes, after reading the post went back and figured it out. Deb! Quote Link to comment Share on other sites More sharing options...
Eagles Ridge Posted June 30, 2009 Report Share Posted June 30, 2009 I love puzzles, easy for me also. My question is I wonder how many High School kids could figure it out. I do not think they are being taught to think any more in school. Quote Link to comment Share on other sites More sharing options...
Eric Posted June 30, 2009 Report Share Posted June 30, 2009 It took me about 6 seconds. Thank you, internet. Sure, it's not as impressive as actually figuring it out, but hey, I work with the tools that are available to me. :D Quote Link to comment Share on other sites More sharing options...
taxxcpa Posted June 30, 2009 Report Share Posted June 30, 2009 Took me ten hours, and I got the wrong answer. Quote Link to comment Share on other sites More sharing options...
JRS Posted June 30, 2009 Report Share Posted June 30, 2009 Still trying. I couldn't understand the formula Wikipedia had. Quote Link to comment Share on other sites More sharing options...
RDennis Posted July 1, 2009 Report Share Posted July 1, 2009 Solved in under 15 seconds--mathematics degree back in the early, early 60s before becoming an accountant. :) Quote Link to comment Share on other sites More sharing options...
wendybooth Posted July 2, 2009 Report Share Posted July 2, 2009 14 year daughter got it in about 2 mins. 17 yr old daughter the 14 yr old had to explain it to her. Sent to husband and he got it in under 30 secs. Quote Link to comment Share on other sites More sharing options...
Edward Posted July 4, 2009 Report Share Posted July 4, 2009 How about: a. 1 x 2 = 2 b. 2 x 3 = 6 c. 6 x 7 = 42 d. 42 x 43 = 1806 e. 1806 x 1807 = 3,263,442 Quote Link to comment Share on other sites More sharing options...
JohnH Posted July 4, 2009 Report Share Posted July 4, 2009 I used a formula: I squared the previous number and then added the multiplier to the product. X2 + X Quote Link to comment Share on other sites More sharing options...
Tax Prep by Deb Posted July 4, 2009 Report Share Posted July 4, 2009 How about: a. 1 x 2 = 2 b. 2 x 3 = 6 c. 6 x 7 = 42 d. 42 x 43 = 1806 e. 1806 x 1807 = 3,263,442 That's the same formula I used. Deb! Quote Link to comment Share on other sites More sharing options...
jasdlm Posted July 7, 2009 Report Share Posted July 7, 2009 2 minutes, but I'm a lawyer, so at least I did better than 'never'! Quote Link to comment Share on other sites More sharing options...
joans Posted July 9, 2009 Report Share Posted July 9, 2009 2 minutes & I figured it out by myself:))) I so proud of myself. Had to look at it awhile. Quote Link to comment Share on other sites More sharing options...
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