This operator lets you choose a subset of the specified questions, chosen at random. It can be used with a question range or a section. This is useful for question banking, when you have a bank of questions and want a certain number of random questions to appear. It can be used with question ranges and with sections; for example:

.appearRandom(5, QRange(100,300)) // display 5 random questions from question range 100-300
.appearRandom(3, Section(4)) // display 3 random questions from section 4