Question

A spinner is divided into four equal sections that are numbered 2, 4, 7, and 9. The spinner is spun twice.How many outcomes have a product less than 30 and contain at least one odd number? A. 5B. 6C. 8D. 10

Answer 1

First, we compute all of the possible results:

(2,2), (2,4), (2,7), (2,9), (4,2), (4,4), (4,7), (4,9), (7,2), (7,4), (7,7), (7,9), (9,2), (9,4), (9,7), (9,9).

Notice that the pair of ressults which its product is less than 30 are:

(2,2),(2,4), (2,7), (2,9), (4,2), (4,4),(4,7),(7,2), (7,4), (9,2).

From the pairs above those from which at least 1 of the numbers is odd are:

(2,7), (2,9), (4,7), (7,2), (7,4), (9,2).

Answer: 6.