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Lecture 17

# 21127 Lecture 17: rec17

Department
Mathematical Sciences
Course Code
21127
Professor
Brendan Sullivan
Lecture
17

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Concepts of Math: Recitation 17
October 26, 2015
Midterm 2 Review
Important: the quality of explanation matters more than quantity of problems solved.
1. Please see Midterm 2 Practice problems, posted on Irina’s Blackboard and https://www.andrew.cmu.edu/course/21-
127/homeworks/practice2.pdf. The solutions are available already. Go over problems
6, 8, 10.
2. In Homework 4 review problems 2 (c,d) and 7. In Homework 5 review problems 1 and
5.
3. Here is a problem that you did in an earlier recitation. Please solve it again. In how
many ways can 18 diﬀerent books be given to Tara, Danny, Shannon, and Mike, so
that one person has six books, one has two books, and the other two people have ﬁve
books each? Now let’s change it a bit. In how many ways can 18 diﬀerent books be
given to Tara, Danny, Shannon, and Mike, so that two people have six books each,
and the other two people have three books each? In how many ways can 18 diﬀerent
books be given to Tara, Danny, Shannon, and Mike, so that three people have ﬁve
books each, and one person has three books?
1