I did my undergrad at university A, and my masters at university B. I am now applying to university C which requires 3 letters of recommendation. Naturally, my thesis advisor is one of them. I also contacted my undergrad advisor whom I did a 4th year project with.
Finding the right third referee is the problem. In my masters, I only took one course with each professor; 8 different courses with 8 different professor. So I don't think that they know my that well, although I did score A in all of the courses. I decided to contact another undergrad professor whom I took 2-3 courses with.
How will the admission committee look to an application where there are 2 referees from my undergrad and only one from grad study ? Will that affect my application in a negative way ?