The Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
magidin@math.berkeley.edu

Posts: 11,740
Registered: 12/4/04
Re: make 100 by using 1, 7, 7, 7, 7
Posted: Nov 13, 2007 10:00 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

In article <1194906476.588777.94330@22g2000hsm.googlegroups.com>,
<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?
>>
>> >How about this: 7+7+7+7+7+7+7+7+7+7+7+7+7+7+1+1. I think, that's the
>> >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
Read make 100 by using 1, 7, 7, 7, 7
dangerousgame95@gmail.com
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Thomas Nordhaus
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
amzoti
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
quasi
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
dangerousgame95@gmail.com
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
magidin@math.berkeley.edu
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Thomas Nordhaus
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
quasi
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Joshua Cranmer
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Raymond Manzoni
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
William Elliot
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
amzoti
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
David R Tribble
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Nat Silver
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Raymond Manzoni
11/12/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Raymond Manzoni
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Adrian Duma
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
benjamin.a.bartsch@gmail.com
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
amzoti
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
David W. Cantrell
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
magidin@math.berkeley.edu
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
David W. Cantrell
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
magidin@math.berkeley.edu
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
briggs@encompasserve.org
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Robert Israel
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Dave Seaman
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
benjamin.a.bartsch@gmail.com
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
amzoti
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
David W. Cantrell
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Jan Kristian Haugland
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Robert Israel
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Kira Yamato
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Kira Yamato
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Robert Israel
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
amzoti
11/14/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Thomas Nordhaus
11/15/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Michael Press
11/14/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Michael Press
11/15/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Kira Yamato
11/15/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Michael Press
11/15/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Rick Decker
11/13/07
Read Re: make 100 by using 1, 7, 7, 7, 7
Raymond Manzoni

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2017. All Rights Reserved.