The Risk I Took Was Calculated
What calculations have I done but I am bad at maths?
The risk is calculated after thinking about the possible positive and negative consequences, their relative probability, etc. It's more like playing poker than slot machines.
Mathematics refers to the use of arithmetic.
So my guess is that the risk I took was calculated, but man, am I bad at math? I thought I was taking the risk of calculating, but I did the wrong calculation [and now I'm living with the painful consequences that I should never have made peace].