Which of the following statements is correct? a. if a series of unequal cash flows occurs at regular intervals, such as once a year, then the series is by definition an annuity. b. if some cash flows occur at the beginning of the periods while others occur at the ends, then we have what the textbook defines as a variable annuity. c. the cash flows for an annuity due must all occur at the ends of the periods. d. the cash flows for an ordinary (or deferred) annuity all occur at the beginning of the periods. e. the cash flows for an annuity must all be equal, and they must occur at regular intervals, such as once a year or once a month.

answer; sales of books;

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.