Three months ago, a professor has offered to me a research position at his university with high salary, and I rejected it because I wanted to join a master's program. Unfortunately, I made a bad decision and now I changed my mind and became very interested to the exciting position he offered to me.
Do you think is it a good idea that I send him an email and ask if the offer is still available? So even that I rejected the offer 3 months ago, is it possible that I ask the professor about that offer again?