Each week a grocery shopper buys either canned (C) or bottled (B) soft drinks. The type of

Question:

Each week a grocery shopper buys either canned (C) or bottled (B) soft drinks. The type of soft drink purchased in 3 consecutive weeks is to be recorded.
(a) List the sample space.
(b) If a different type of soft drink is purchased than in the previous week, we say that there is a switch. Let X denote the number of switches. Determine the value of X for each elementary outcome. [Example: For BBB, X = 0; for BCB, X = 2.)