Doing homework, just learning this new topic. Need help with a good explanation , as possible as you can.

Part A. Let the sample space beS= {b, s, h, w}. How many events are there?

Part B. Two tetrahedrons (4 sided), each with equal sides numbered from 1 to 4, are identical except that one is red and the other green. If the two tetrahedrons are tossed and the number on the bottom face of each is observed, find the number of outcomes in the event "the sum of the numbers is5".