frank
2004-02-10 01:56:48 |
four times???
Can you make 13 by using 4 four times, no power(except 4,4) you can use brackets. |
Charlie
2004-02-10 08:37:03 |
Re: four times???
The forums are not for posting puzzles. Click on Submit a Problem on the Home page of this site. |
Brian Smith
2004-02-10 11:12:29 |
Re: four times???
This puzzle is well known enough that typing "four 4" into google brings up pages with the solutions for 1 to 100. |
Sam
2004-02-10 19:42:05 |
Hmmm
Hmmm, I can't say I agree with the answer though...
If the only power that is allowed is 4^4, why on earth is Sqrt allowed? Square root is mearly short hand for 4^(1/2), no? Are cube roots allowed, fifth roots?
Ummmm... not that I'm discussing a puzzle in the forum. I wouldn't do that. |
TomM
2004-02-11 14:26:52 |
Re: four times???
The point is that no numeral (other than the four 4's) is used in the expression. 4^4 uses two of the 4's but no other numeral. 4^3 uses a forbidden 3. The radical symbol can be used, but only for Square root (which is the symbol alone) or Quartic root (which uses up one of the 4's) |
