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Topic: make 100 by using 1, 7, 7, 7, 7
Replies: 41   Last Post: Nov 15, 2007 6:13 PM

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 magidin@math.berkeley.edu Posts: 11,749 Registered: 12/4/04
Re: make 100 by using 1, 7, 7, 7, 7
Posted: Nov 13, 2007 10:00 AM

<dangerousgame95@gmail.com> wrote:
>On Nov 12, 5:13 pm, quasi <qu...@null.set> wrote:
>> On Mon, 12 Nov 2007 22:14:03 +0100, Thomas Nordhaus
>>
>> <thnord2...@yahoo.de> wrote:

>> >dangerousgam...@gmail.com schrieb:
>> >> So, using only +, -, x, /, and parentheses, and ONLY these numbers:
>>
>> >> 1, 7, 7, 7, 7
>>
>> >> how can you make 100? Is there more than one solution?
>>
>> >only solution.

>>
>> The implication of showing four 7's is that you are supposed to use
>> only those four 7's, and hence, only one 1.
>>
>> If you allow any number of 7's and 1's, it should be obvious that
>> there are infinitely many solutions.
>>
>> quasi

>
>Thank you, that's what I meant, I should have made that clear.
>
>So anyone know of any arrangement?

You mean, besides the obvious 177-77 ?

--
======================================================================
"It's not denial. I'm just very selective about
what I accept as reality."
--- Calvin ("Calvin and Hobbes" by Bill Watterson)
======================================================================

Arturo Magidin
magidin-at-member-ams-org

Date Subject Author
11/12/07 dangerousgame95@gmail.com
11/12/07 Thomas Nordhaus
11/12/07 amzoti
11/12/07 quasi
11/12/07 dangerousgame95@gmail.com
11/13/07 magidin@math.berkeley.edu
11/12/07 Thomas Nordhaus
11/12/07 quasi
11/12/07 Joshua Cranmer
11/12/07 Raymond Manzoni
11/13/07 William Elliot
11/13/07 amzoti
11/12/07 David R Tribble
11/12/07 Nat Silver
11/12/07 Raymond Manzoni
11/12/07 Raymond Manzoni
11/13/07 benjamin.a.bartsch@gmail.com
11/13/07 amzoti
11/13/07 David W. Cantrell
11/13/07 magidin@math.berkeley.edu
11/13/07 David W. Cantrell
11/13/07 magidin@math.berkeley.edu
11/13/07 briggs@encompasserve.org
11/13/07 Robert Israel
11/13/07 Dave Seaman
11/13/07 benjamin.a.bartsch@gmail.com
11/13/07 amzoti
11/13/07 David W. Cantrell
11/13/07 Jan Kristian Haugland
11/13/07 Robert Israel
11/13/07 Kira Yamato
11/13/07 Kira Yamato
11/13/07 Robert Israel
11/13/07 amzoti
11/14/07 Thomas Nordhaus
11/15/07 Michael Press
11/14/07 Michael Press
11/15/07 Kira Yamato
11/15/07 Michael Press
11/15/07 Rick Decker
11/13/07 Raymond Manzoni