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April 4th, 2012, 12:45 PM  #1 
Member Joined: Jan 2012 Posts: 39 Thanks: 0  find a pattern/sequence
The following list of words contains something in common. Your task is to determine what and decide which other words belong on the list as well. NOTE: The order of the words on this list is not important. • four • Mars • Friday • Four • September Which of the following car companies belongs on the list? Chrysler Ford GM They all belong on the list. 
April 4th, 2012, 06:56 PM  #2 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: find a pattern/sequence
How's it going Westworld? They all have the letter r once so only Ford belongs on the list. 
April 4th, 2012, 07:35 PM  #3 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: find a pattern/sequence
The fifth letter, if any, is a vowel. So Ford and GM are in but Chrysler is out.

April 5th, 2012, 11:06 AM  #4 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,184 Thanks: 481 Math Focus: Calculus/ODEs  Re: find a pattern/sequence
"four" has 4 letters and is the 4th natural number. "Mars" has 4 letters and is the 4th planet from the sun. "Friday" has 6 letters and is the 6th day of the week. "September" has 9 letters and is the 9th month of the year. Using this rule then: "GM" has 2 letters and is the 2nd largest automobile manufacturer in the world. "Ford" has 4 letters and is the 4th largest automobile manufacturer in the world (some list Ford as 3rd, some as 5th, so I am unsure about this one.) "Chrysler" has 8 letters but is not the 8th largest automobile manufacturer in the world (Renault is), so it is not on the list. 
April 5th, 2012, 11:36 AM  #5 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: find a pattern/sequence
Four, Mars, Friday, and September can all trace their roots back to AngloSaxon or Latin. Of the companies listed, only Ford can do so.

April 15th, 2012, 06:44 PM  #6 
Senior Member Joined: Apr 2011 From: USA Posts: 782 Thanks: 1  Re: find a pattern/sequence
Since there are two "four"s, and one is capitalized, I decided that four of the words are capitalized, and therefore all 3 car companies would belong in that list. There is no right answer to something like this, although there are people who would say there is. It's whatever someone thinks it is. 

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