Ch9 ex2 solution uses other numbers

[mpas97]

Exercise 2 in chapter 9 says:
Use Enum.reduce/2 to multiply these numbers together: [5, 12, 9, 24, 9, 18]
The solution then reads:
Use Enum.reduce/2 to multiply these numbers together: [2, 4, 991, 2543]

This is confusing as we probably just want the compare the computed result.