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10-04-2010, 03:45 PM
| | Registered User | | Join Date: Sep 2000 Location: Florida | | | Mathematics Question
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I'm supposed to extend the series by two.
The nubers are:
30, 17, 32, 15, 34
If I'm correct the next 2 numbers would be 21 and 36.
If I'm understanding this correctly, the series would be -13, +15, -17, and +19 and after the "34" I'd start the series over from -13.
If I'm wrong, please enlighten me. I am slightly confused as I was asking a couple of family members to double check for me and they're saying something completely different as to what I thought I heard the professor explain.
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10-04-2010, 03:49 PM
|  | Louisiana Superdome. S 127. R 22. S 12-13. Moderator | | Join Date: Feb 2002 Location: Mobile, Al | | | Why would you start over? Why not continue w/ -21 and +23?
34 - 21 = 13
13 + 23 = 36
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10-04-2010, 03:50 PM
| | Registered User | | Join Date: Apr 2007 Location: Anasleim, CA | | | Not 13, 36? |
10-04-2010, 03:51 PM
|  | I took the one less traveled by | | Join Date: Mar 2002 Location: Reims, Champagne, France | | | ,13,36 ? |
10-04-2010, 03:51 PM
| | | | Looks to me like 13, 36.
Adding 2 to odd entries and subtracting 2 from even entries. |
10-04-2010, 03:53 PM
| | Registered User | | Join Date: Jul 2005 Location: Metro Detroit, Michigan | | Quote:
Originally Posted by SnakeKappele Looks to me like 13, 36.
Adding 2 to odd entries and subtracting 2 from even entries. | Boom. Done. Ah, non-calculus based mathematics amuses me. |
10-04-2010, 03:56 PM
| | I took the one less traveled by | | Join Date: Mar 2002 Location: Reims, Champagne, France | | | Oh, you could certainly write it down with calculus.
This one just seems more based on toilet crossword book logic. |
10-04-2010, 04:58 PM
| | Registered User | | Join Date: Nov 2005 Location: Listowel/KW Ontario | | Quote:
Originally Posted by SnakeKappele Looks to me like 13, 36.
Adding 2 to odd entries and subtracting 2 from even entries. | This.
lowsound
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10-04-2010, 05:23 PM
| | Registered User | | Join Date: Feb 2009 Location: Tampa, Florida, US | | Quote:
Originally Posted by SnakeKappele Looks to me like 13, 36.
Adding 2 to odd entries and subtracting 2 from even entries. | Yea this.
How'd you come up with your answers?
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10-04-2010, 07:39 PM
| | Registered User | | Join Date: Sep 2000 Location: Florida | | | Okay, it seems everyone's agreeing the 36 part is right but I don't see how most of you came up with "13." Please explain. (In laymen terms)
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10-04-2010, 07:52 PM
|  | Registered User | | Join Date: Apr 2001 Location: berkeley, ca | | Quote:
Originally Posted by cassanova Okay, it seems everyone's agreeing the 36 part is right but I don't see how most of you came up with "13." Please explain. (In laymen terms) | think of'em as two sequences, one going 30, 32, 34, 36, and the other one going 17, 15, 13. then just alternate'em. |
10-04-2010, 08:15 PM
|  | Registered User | | Join Date: Jul 2008 Location: Eh? | | Two series: Code: 30--32--34 (36)
--17--15-- (13) Do you see them?
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10-05-2010, 08:19 AM
| | Registered User | | Join Date: Jun 2007 Location: Takoma Park, MD (DC) | | Quote:
Originally Posted by Jazz Ad This one just seems more based on toilet crossword book logic. | I agree, this hardly qualifies as "mathematics". Pattern recognition, maybe? |
10-05-2010, 08:57 AM
| | Registered User | | Join Date: Apr 2007 Location: Norway | | | one goes up by 2 as the other goes down. looks like the most logical next two would be 13,36
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10-05-2010, 11:31 AM
| | Registered User | | Join Date: Sep 2000 Location: Florida | | Quote:
Originally Posted by L-A Two series: Code: 30--32--34 (36)
--17--15-- (13) Do you see them? | Yes, I see them. I must've misunderstood what the professor told us to do.
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I don't look for used condoms but I seem to find them all the time - Kwesi
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10-05-2010, 11:35 AM
|  | Registered User | | Join Date: Jan 2009 Location: Purple Mountain Majesties | | Quote:
Originally Posted by Jim Nazium I agree, this hardly qualifies as "mathematics". Pattern recognition, maybe? | +1
It's an excersize in pattern recognition and conjecture. I just helped my high school sophomore with this chapter last night.
Though not technically mathematics, it is a precursor to mathematic disciplines like geometry.
It can be perceived as simple math if you state the postulate something like, "increase the larger number by 2 while reducing the smaller number by 2," or words to that affect.
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Last edited by electracoyote : 10-05-2010 at 11:43 AM.
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