Answer:
Mariah not choosing three mysteries.
Step-by-step explanation:
We have been given 5 mysteries, 7 biographies, and 8 science fiction novels
Total number of novels =5+7+8=20
We need to find complement of mariah choosing three mysteries
Complement is negation of the statement
Hence, Complement of mariah choosing three mysteries is:
Mariah not choosing three mysteries.
