Using only two 2’s and any mathematical operations, functions and symbols that you want (and I mean ANY!), try to make two 2’s equal to 5. Trust me, this problem is harder than it looks as you would find out if you choose to solve this problem. So, if you really want a difficult challenge, then try to solve this first before looking at the solution.
When a friend of mine gave this problem to me , I thought that it’s not even that challenging. I was very surprised at the level of difficulty of this deceptively simple-looking problem. Through several trials and errors and probably dumb luck, I eventually solved it but I felt very dizzy afterwards.
Now, here’s the solution,
, which is equal to
As you can see, the solution involved a decimal, a square root, an exponent and a negative number! If you also found this solution by yourself, then I’d like to congratulate you.
In hindsight, it’s pretty easy to find another solution. Admittedly, though, it’s almost the same as the first solution: