Q:

Spinner i is divided into four equal sections labeled 2, 3, 4 and 5. spinner ii is divided into five equal sections labeled 1, 3, 5, 7 and 9. if each spinner is spun and the resulting numbers are multiplied, what is the probability that the product is a two-digit even number? express your answer as a common fraction.

Accepted Solution

A:
The probability is 7/20.

There are 20 outcomes in the sample space:
2(1)   2(3)   2(5)   2(7)   2(9)
3(1)   3(3)   3(5)   3(7)   3(9)
4(1)   4(3)   4(5)   4(7)   4(9)
5(1)   5(3)   5(5)   5(7)   5(9)

Out of these, 14 are two digit products.  Out of those 14, only 7 are odd.  Thus the probability is 7/20.