MAD 2104 Midterm: MAD 2104 FIU Exam 411k
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Prof. s. hudson: [30pts] show that the union of two countable sets is always countable. Remarks and answers: the average of the top 20 grades was approx 74 / 100. The lowest grades were mostly on problem 1, but the rest were ok on average. As on quiz 3, i have estimated your semester grade in the upper right corner. But this time, i added your best 3 out of 4 quiz grades, so far. / 300, which is (of course) higher than before. I used a scale of a"s 270-300, b"s 240-270, etc. Because of the change in the calculations (eg now dropping the lowest grade), the new estimate may seem inconsistent with the one on quiz 3. Please check all this, and see me if anything looks wrong to you: there weren"t many good answers to this one. The main steps should be something like this;
