math

math
A student of mine is an economist. In order to understand his field, I read an introductory book on probability theory recently. There I met again formulas which I had studied at senior high school, for the first time in these 30 years. My maths had gone to complete oblivion. But!! My daughter is just a high school student and she is good at maths. I asked what I didn't understand and got on her nerves.(-_-)