I have a bachelor degree in Mathematics, participate in a lot of mathematics competitions in high school (including IMO) and in university, currently doing masters in mathematics. However, if it wasn't for special case I would say I never use the maths in my work.
Here is how once I used mathematics. So I was developing a network with multiple nodes, which had to be tested and get statistic. We also wanted that the network to be balanced (each node connected to the same number of nodes), and that's where my graph theory skills came in handy. I quickly modelled the problem, found the answer and implemented it.
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