Question

A spinner is spun twice. it has a 3,5,7, and 9 on it. how many outcomes could produce a product greater than 21?

Answer choices:
12
10
11
13

Answer 1

Number of outcomes on which we get a product greater than 21 is:

11

Explanation:

The sample space we get on spinning a spinner twice is:

{33,35,37,39,53,55,57,59,73,75,77,79,93,95,97,99}

The outcomes on which we get a product greater than 21 is:

{39,55,57,59,75,77,79,93,95,97,99}

Hence, number of outcomes on which we get a product greater than 21 is:

11

Answer 2

11

Explanation:

What numbers on both spins would create a PRODUCT GREATER THAN 21?

3 and 9

5 and 5

5 and 7

5 and 9

7 and 7

7 and 5

7 and 9

9 and 9

9 and 3

9 and 5

9 and 7

So, as we can see, we have 11 possibilities of getting a product GREATER than 21 (not 21...).

Correct answer is 11.