MATH 4023 Midterm: MATH 4023 LSU 4023f06 Exam 2a
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Answer each of the questions on your own paper, and be sure to show your work so that partial credit can be adequately assessed. Put your name on each page of your paper: [12 points] (a) if s and t are nite sets, write the formula relating |s t |, |s|, |t |, and |s t |. It is not necessary to verify the formula, just write it down. |s t | = |s| + |t | |s t | . (b) the following is a portion of a report submitted by a marketing analysis employee: Explain why this report cannot be correct. (hint: part (a) may be useful. ) S = {consumers interviewed who use brand x} , and. T = {consumers interviewed who use brand y } . Then from the data given, |s| = 78, |t | = 71, |s t | = 48.
