In a simplified algebraic expression which of the operations determines the number of the terms?

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.

How do i answer this i do not get this at