the answer to this is probably totally obvious but i suck at probablility
A 5th grade class has sixteen girls and twelve boys. Each week, the teacher randomly draws a student to clean out the fish tank. Once a student is chosen, they are not put back into the drawing until everyone else has had a turn. What is the probability that:
a. A boy will be chosen the first week and a girl the second week.
b. Sarah (a girl) will be the last student chosen if the order of the students before her does not matter
can someone help me with this in a way i can understand?