Maths Question, not too hard.?

Question

Using four 4s find the number 13.

E.g- finding number 5- 4 x 4= 16. 16+4=20. 20divided by 4=5

You can use any mathematical term except squared.

Answer 1

The above answerer has:
4+4+4+4/4 = 13
which has too many 4s.

This is an old trick question. You can do alot of small numbers by using "four 4s."

The answer is:

4! / √4 + 4/4

Although that's not a unique answer, of course. There is always more than one answer. I'd challenge people to find 123 using only four 4s.

And for my challenge, I'd like the answer to be simpler than the excessively long solution that Zaphod plagiarized from Wikipedia. Even if he allegedly found it on his own (not that doing a wiki search of "four fours" doesn't immediately blast that formula right in front of you), it uses HOW MANY operations?? To get 123 it uses what, 250? Ridiculous. There's a solution with only a few operations necessary.

Answer 2

Here is a generalized way to produce ANY natural number N with four 4's (both '13' and '123' are only 1/∞ of the possibilities here); whence solutions yielding a specific value of N seem superfluous...
Please see:
http://www.mudandmuck.com/str2/4-4s.JPG

Therefore,

13 =
log[ log(4)/log( √√√√√√√√√√√√√√√√√√√√√√√√∜4) ] / log(4)
http://mudandmuck.com/str2/13.htm
If your browser does not display it, ∜ is the fourth-root symbol which contains one of the 4's. There are 24 square root symbols preceding it.

Thank you for your attention.

That's an outrageous and slanderous accusation from Cheeser: I derived this solution myself and I have never seen any Wikipedia article regarding this. Does he think that something like this could not be independently derived? His lies are inflammatory and should be expurgated: this miscreant has been a continual malcontent on Answers and he gets annoyed when someone shows a skill or method that he didn't think of.

After reviewing the Wikipedia article, it should be obvious to anyone with half a brain that mine was not copied! It is not the same. The Wikipedia solution only contains three fours anyway!! And if I wanted to plagiarize, I could have copied the short solution for 123 located on the same page!! The guy is a scurvy slanderer and a jackass.

Answer 3

D4th's answer uses 5 4s, not 4, so it doesn't work!
Here's another with 5 4s:
4+4+4 +4/4 = 13.
Here's a solution with 4 4s.
13 = 4!/√4 + 4/4.

Answer 4

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Answer 5

I see two different ways to do this.

4/4=1
1+4=5
5+4=9
9+4=13

Alternatively:

4!=24
24-4=20
20/4=5
5+4=9
9+4=13

Answer 6

44/4 + sqrt(4) = 13

Answer 7

9x4=36 36+4=40 40-27=13