Probability, true/false

Question

Natalie guessed on the last three problems of her true/false test. What is the probability she got two right?

Answer 1

Let C = answer to a given question is correct and W = answer to the question is wrong

The possibilities are: CCC, CCW, CWC, CWW, WWW, WWC, WCW, WCC

There are 8 possibilities, 3 of which have exactly 2 correct answers.

P(exactly 2 correct answers) = 3/8 = 0.375