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A Perplexing Expression (Posted on 2005-10-14) Difficulty: 3 of 5
Using only math symbols (no functions like sin, cos, log, etc.) create an expression with only two 2s equal to 5 (no other digits or constants).

See The Solution Submitted by Brian Smith    
Rating: 3.5000 (6 votes)

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re(2): perhaps? -- spoiler perhaps. | Comment 5 of 18 |
(In reply to re: perhaps? by derek)

Only [ ... ] is usually the floor function, rather than the ceiling function, making [sqrt(22)] = 4, rather than 5.

However, it's easily convertible:

-[-sqrt(22)]

Of course sqrt would be written in the surd form, so as to be a math symbol instead of letters.  The floor of the negative value would indeed by -5 and then negating it would make 5.


  Posted by Charlie on 2005-10-14 21:10:53
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