Number 15 and 18 please

770 CHAPTER 11 Counting Methods and Probability Theory In Exercises 13-14, it is equally probable that the pointer on the 20 spinner shown will land on any one of the eight colored regions. If the pointer lands on a borderline, spin again. 21 yellow blue green red red green blue yellow 13. If the spinner is spun once, find the probability that the pointer will land on red or blue. 14. If the spinner is spun twice, find the probability that the pointer lands on red on the first spin and blue on the second spin. Fi 15. A region is prone to flooding once every 20 years. 22 The probability of flooding in any one year is 20. What is 23 the probability of flooding for three consecutive years? 24 16. One card is randomly selected from a deck of 52 cards. Find the probability of selecting a black card or a picture 25 card. 20 17. A group of students consists of 10 male freshmen, 15 female freshmen, 20 male sophomores, and 5 female sophomores. If one person is randomly selected from the group, find the 2' probability of selecting a freshman or a female. 18. A box contains five red balls, six green balls, and nine yellow balls. Suppose you select one ball at random from the box and do not replace it. Then you randomly select a second ball. Find the probability that both balls selected are red