24. savings the brewsters are saving for their daughter's college days. they would like to be able to withdraw $800 each month from their account for five years once their daughter starts college. assuming that their account will earn interest at the rate of 9% compounded monthly, what sum of money should the brewsters have in the account when their daughter starts college?
37. how many p word college? 38. how many permutations are there of the letters in the word intelligible? 39. for an experiment, 12 sociology students are to be the other containing 5 students. in how many ways can groups, one containing 7 students and divided into two this grouping be done? on their spring break 40. fifteen students are going hiking they plan to travel in three vehicles-one seating 7, one seating 5, and one seating 3 students. in how many ways can the students group themselves for their trip? 41. concert performers a star musical performer is giving a concert at state university. at the concert, she will pre- c sent 13 songs, 4 of which are which are rock 'n' roll, and 6 of which are pop numbers. in how many ways can the star arrange her concert if songs within a category are considered indistinguishable? 42. six indistinguishable red balls and four indistinguishable green balls are arranged in a line. how many distinguish- able arrangements of these balls are possible? 43. five indistinguishable red balls, three indistinguishable green balls, and two indistinguishable blue balls are arranged in a line. how many distinguishable arrange ments of these balls are possible? country and western, 3 of 44. ten books are to be arranged on a shelf. four of the boo have red covers 3 houg onother 3 ha