# Question: could someone check out part b i am pretty sure...

###### Question details

Could someone check out part b)? I am pretty sure the given answer is wrong and the real answer should be an empty set. This is in reference to section 1.4 # 2b of How to Prove It 2nd edition. - edit- I figured someone would be able to go to the exact question I was referring to but here it is. When I do part B I get empty set.