Question 1193917
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(1) The textbook answer you show doesn't make any sense.  Are you looking at the answer for a different problem?<br>
(2) The statement of the problem is deficient -- it doesn't define what a "course" is.  Even if we assume that a "course" is a soup, a main meal, a dessert, and a drink, it is possible that the two different courses might contain, for example, the same soup.<br>