Answer:
10 different sets.
Step-by-step explanation:
You label the books as follows:
a. to kill a mockingbird
b. all quiet on the western front
c. the stranger
d. the adventure of huckleberry Finn
e. midsummer nights dream
you then separate the books into sets of three without repeating the same books twice as follows:
ABC
ABD
ABE
ACD
ACE
ADE
BCD
BCE
BDE
CDE
Now you have all the possibilities of three different book in a set.