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




Re: make 100 by using 1, 7, 7, 7, 7
Posted:
Nov 13, 2007 12:24 PM


David W. Cantrell <DWCantrell@sigmaxi.net> writes:
> amzoti <amzoti@gmail.com> wrote: > > On Nov 13, 7:28 am, "Benjamin A. Bartsch" > > <benjamin.a.bart...@gmail.com> 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? > > > > > > > (7+1/7)*7*(7/7+1) > > > > > > Benjamin > > > > That has five 7's and you are only allowed 4. > > Right. But I'm not sure that the "solution" 177  77 is legitimate either > since it uses juxtaposition, which is not something which the OP mentioned > that could be used. > > Here's a different solution which does not use juxtaposition: > > 7 x 7 + 7 + 7 + 1
Using base 8, are we?  Robert Israel israel@math.MyUniversitysInitials.ca Department of Mathematics http://www.math.ubc.ca/~israel University of British Columbia Vancouver, BC, Canada



