Question 1208383
<pre>
In mathematics, there is only one number that is labeled "5" or "five" or "V".

A = {4, 5, 6, 5} is not "wrong", it's simply not the simplest way to
write A = {4, 5, 6}.

Writing 2+3 is not "wrong", it's just simpler written as 5.

Edwin</pre>