up vote 6 down vote favorite
2

Can you find a way to make 2 0 = 1 5 by adding any operations or symbols? You can use symbols such as these: +, -, *, !, ^, (). It is not limited to this list.The symbols may be added either between or on the outsides of the numbers provided. You may also concatenate.

I would like to see creative ways to make this work. Good Luck!

P.S. You can not add any other numbers to the equation.

share|improve this question

closed as too broad by Alconja, Ankoganit, Peregrine Rook, JonMark Perry, Mithrandir Jan 9 at 8:23

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • I honestly don't understand why the "1 1 1 1 = 5" has gotten 22 upvotes, protection by Community, and 7k views and now the OP creates another question and it get's put on hold??? What's the difference? – NL628 Jan 10 at 1:41
  • @NL628 That is the same thing I was thinking. I literally used the same format, but just different numbers. I hope that the edit that I made will convince people to reopen the question. – kraby15 Jan 10 at 4:41
up vote 9 down vote accepted

How about this??

$2^0 = 1^5$

or

20 != 15
where != means "is not equal to", similar to = meaning "is equal to".

share|improve this answer
  • I don't think the second one is correct - not unless 0! = -3. (It doesn't, does it?!?) – YowE3K Jan 9 at 7:27
  • @JonMarkPerry - Ahh - I think your edit corrupted hayoon's second answer – YowE3K Jan 9 at 7:30
  • @YowE3K; maybe, but 20!=15 is completely meaningless, so i assume he meant to type 2-0!=1.5 which is reasonably consistent with his first answer – JonMark Perry Jan 9 at 7:33
  • 1
    @JonMarkPerry it is not meaningless, actually - The != is the nonequal operator, i.e. 20 is not equal to 15. – Lolgast Jan 9 at 7:47
  • @Lolgast; lateral - i like it! – JonMark Perry Jan 9 at 7:49
up vote 8 down vote

These can also work

$(2 + 0!)! = 1 + 5$
$2 + 0 = \sqrt{-1 + 5}$
$.2 + 0 = 1 / 5$

share|improve this answer
up vote 3 down vote

Here's one answer:

2 - 0! = 1 ^ 5

Note that:

The factorial of 0 is 1.

share|improve this answer
  • 1
    You know that $2! = 2$. So you may want to remove that ! to use less symbols. – ibrahim mahrir Jan 9 at 5:24
  • Ha ha, good spot, @ibrahimmahrir , thank you. – Phylyp Jan 9 at 5:31
up vote 1 down vote

Here is another way:

$2 + 0 = 1 / .5$

And another:

$2^{-0!} = 1 - .5$

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.