Suppose 3 bulbs are selected at random from a lot. Each bulb is tested and classified as defective (D) or non-defective (N). Write the sample space of this experiment.

From 3 bulbs selected at random we denote the outcome by NDN which means that the 3 bulbs selected consists of first non-defective, second defective and third non-defective and similarly we have other outcomes like NND, NDD etc.

The sample space is given by:

S = {DDD, DDN, DND, DNN, NDD, NDN, NND, NNN}