In vitro fertilization (IVF) is a technique in which egg cells are fertilised by sperm outside the woman's womb. IVF is a major treatment in infertility when other methods of achieving conception have failed. Of course, this is a biology-related issue and we've decided to simplify what IVF really is in something that most people can understand using mathematics.
Looking at the circled(or ovaled, if you really are that specific) region, that whole statement simply means :
Probability of being a MUM = Probability of a Male + Probability of a Female - Probability of a Male intercepting a Female.
And that was what was written in class as seen in the photo, so it must be true.
Afterall, teachers are never wrong. X)
