Although Samantha likes both oolong and green tea, none of her friends likes both.
Statements
Sam likes O and G. None of her friends like both (they either just like O, just like G, or like neither). All of her friends like B.
Evaluate
Must Be False questions are about picking an answer that contradicts something we know. They function two common ways: 1. correct answer contradicts a conditional 2. correct answer contradicts some inference we can make by combining ideas.
Are there any conditionals?
Yes, two of them (none / all): friend of Sam → ~Like O or ~Like G friend of Sam → Like B
So a correct answer could say, . Or .. .
Are there any inferences we can make by combining ideas?
When we have to All statements about the same group, we can infer that there's Some overlap for the outcomes.
If we know All A's are B + All A's are C then we can infer some B's are C
Since we know All S's friends like B All S's friend ~like O or ~like G then we can infer there is someone who likes black tea but doesn't like both oolong and green tea.
Goal
Look for an answer that contradicts something we were told or something we can derive.