Answer:
Explanation:
Given that 
S(x) stand for "x is smart". 
 Y(x) stand for "y is young". 
 C(x) stand for "x is a CS Major"
1) All CS majors are smart : C(x) ⇒ S(x)
2) Some CS majors are smart and not young.: There exists a∈C(x) such that a ∉ Y(x)
3) No young college students are CS majors.: ~Y(s)⇒CS(x)