[quote]Ambiguity is when a problem suffers a parenthesis displacement, common ones are 48/2(9+3) which can give you 288 or 2. 6/2(1+3) is basically the same thing giving you 9 or 1[/quote] Both of those problems can be rewritten as 48/2*12 and 6/2*4 respectively. The fact that there are parentheses in the problem may confuse you, but it does not make the problem ambiguous in any way.