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9 replies to this topic

#1 ALFRED

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Posted 21 March 2008 - 04:34 PM

I have a feeling this may give some people a challenge. Although there are always a few of you out there that seem to get these right away.

42, 40, 36, 39, 45, 46, 48, 52, 49, 54

What comes next in the sequence and why?
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#2 Browne85

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Posted 21 March 2008 - 04:39 PM

I have a feeling this may give some people a challenge. Although there are always a few of you out there that seem to get these right away.

42, 40, 36, 39, 45, 46, 48, 52, 49, 54

What comes next in the sequence and why?



Spoiler for answer

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#3 ALFRED

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Posted 21 March 2008 - 04:55 PM

Spoiler for answer


That is the correct answer but quite not the correct solution. Our solutions are related but that's not the method I used.
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#4 ALFRED

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Posted 21 March 2008 - 06:25 PM

Spoiler for answer


Here is a three-digit example that uses my mathematical theory but would not work with yours:

156, 211, 200, 178, 255, 288, 354, 365, 387, 431 . . .
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#5 grey cells

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Posted 22 March 2008 - 03:41 PM

I have a feeling this may give some people a challenge. Although there are always a few of you out there that seem to get these right away.

42, 40, 36, 39, 45, 46, 48, 52, 49, 54

What comes next in the sequence and why?

Spoiler for Does it have something to do with

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#6 grey cells

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Posted 23 March 2008 - 12:51 PM

I have a feeling this may give some people a challenge. Although there are always a few of you out there that seem to get these right away.

42, 40, 36, 39, 45, 46, 48, 52, 49, 54

What comes next in the sequence and why?

Spoiler for reversing

Edited by grey cells, 23 March 2008 - 12:51 PM.

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#7 ALFRED

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Posted 23 March 2008 - 10:18 PM

Spoiler for reversing


Spoiler for hint

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#8 grey cells

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Posted 24 March 2008 - 01:52 PM

Thanks Alfred . I have been trying to get the answer for the Past 2 days. I am going to post the solution even if you have given it away. :D
Spoiler for Solution
GREAT puzzle , this.Please keep posting more such puzzles. :)And I want to add that this puzzle is a paradise for multiples.I tried adding instead of subtracting and I got .. guess what... a whole horde of multiples of 11!!!!

Edited by grey cells, 24 March 2008 - 01:59 PM.

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#9 ALFRED

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Posted 24 March 2008 - 02:40 PM

Thanks Alfred . I have been trying to get the answer for the Past 2 days. I am going to post the solution even if you have given it away. :D

Spoiler for Solution
GREAT puzzle , this.Please keep posting more such puzzles. :)And I want to add that this puzzle is a paradise for multiples.I tried adding instead of subtracting and I got .. guess what... a whole horde of multiples of 11!!!!


Nice work grey cells! I learned about the multiples of 9 trick as an accountant. If you ever have a difference when reconciling accounts you divide that difference by 9. If it's a multiple - chances are you have a transposition error somewhere in your work. Now as for why you were able to come up with multiples of eight when took the difference from the next number is another puzzle in itself. I'm going to check and see if it continues working for 7, 6, 5... as you progress.
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#10 grey cells

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Posted 24 March 2008 - 02:48 PM

Thanks ALFRED for the information.Please do keep coming up with more such new ideas. :)
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