Which of the following three inferences are valid? (There is noneed to explain your answers.)
(a) ﾃつﾃつﾃつﾃつﾃつﾃつ Premise:ﾃつﾃつﾃつﾃつﾃつﾃつﾃつﾃつ Liu Yang spendstwo hours every day playing the violin.
Conclusion: ﾃつﾃつﾃつﾃつ Liu Yang wants to be a goodviolinist.
(b) ﾃつﾃつﾃつﾃつﾃつﾃつ Premise:ﾃつﾃつﾃつﾃつﾃつﾃつﾃつﾃつ If Liu Yang is inclass, she is on campus.
Premise: ﾃつﾃつﾃつﾃつﾃつﾃつﾃつﾃつ LiuYang is on campus.
Conclusion: ﾃつﾃつﾃつﾃつ Liu Yang is in class.
(c) ﾃつﾃつﾃつﾃつﾃつﾃつ Premise:ﾃつﾃつﾃつﾃつﾃつﾃつﾃつﾃつ If Liu Yang is inclass, she is on campus.
Premise: ﾃつﾃつﾃつﾃつﾃつﾃつﾃつﾃつ LiuYang is in class.
Conclusion: ﾃつﾃつﾃつﾃつ Liu Yang is on campus.
