There are 3 possibilities when choosing 1 of 3 books. There are 8 possibilities when choosing 1 of 8 books. Events are independent of each other so "and" would be to multiply. 3 × 8 = 24 possible combinations
You can also see by writing out the possibilities.. Say names of books are {A,B,C} and names of CD's are {1,2,3,4,5,6,7,8} A1, A2, A3, A4, A5, A6, A7, A8 B1, B2, B3, B4, B5, B6, B7, B8 C1, C2, C3, C4, C5, C6, C7, C8
Probability of event A ( Tesha will not be picked as a guide ) : P ( A ) = Number of ways it can happen / Total number of outcomes P ( A ) = (29 - 2) / 29 = 27 / 29 ≈ 0.93 Answer: The probability that Tesha will not be picked as a guide is 0.93 or 93 %.
