The numbers 0-9 are lined up in a row, like this:
0 1 2 3 4 5 6 7 8 9
You have to put in + and - signs in the blanks, so that in the end it will all equal 1.
Also, if possible, try to make expressions resulting in 0 and -1.
(In reply to
Solution plus by Bryan)
In response to Bryan's last line:
>>I think a good question now would be: what is the first
>>positive integer that cannot be achieved by adding + and -
>>signs to the digits 0 through 9?
the answer is 46 if I understand the question correctly. The highest number possible is 45 with all numbers added. Remember that: S = n(n+1)/2 where S is the sum of the first n digits.
BTW, I'm wondering about the legality of combining two digits together as in this post and the previous.
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Posted by Chris
on 2003-05-21 08:58:39 |
re: Solution plus
