Saturday, July 28, 2018

mathematics - Make 5 5 5 5 = 19



Can you find a way to make:



$5\ 5 \ 5 \ 5 = 19$



by adding any operations or symbols? You can use only these symbols:



$+,\ -,\ *,\ !,\ /,\ \hat\, ,\ ()$.




It is limited to this list, and concatenation is also allowed. You cannot add other numbers to the equation.



Answer



Here's one way I found:



$\dfrac{5!-(5\times 5)}{5}=19$



Or, using just the characters explicitly allowed in the question:



(5! - (5 * 5)) / 5 = 19




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