Re: make 100 by using 1, 7, 7, 7, 7
- From: Kira Yamato <kirakun@xxxxxxxxxxxxx>
- Date: Tue, 13 Nov 2007 13:51:55 -0500
On 2007-11-13 13:22:13 -0500, Robert Israel <israel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> said:
"Benjamin A. Bartsch" <benjamin.a.bartsch@xxxxxxxxx> writes:
dangerousgam...@xxxxxxxxx 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?
--> (1/7+7)*(7+7)
Benjamin
Yes, and that's the only solution (up to commutativity).
I'm very curious how you concluded this. Was it by a program that tests through all possible combinations?
I tried to write a program too, but I stop when I couldn't quickly find a way to list out all possible trees with 7 leaves.
--
-kira
.
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