You cannot ride the roller coaster if you are under 4 feet tall unless you are older than 16 years old"
Let q,r, and s represent "You can ride the roller coaster." "You are under 4 feet tall," and "You are older than 16 years old", respectively.Then the sentence can be translated to
it means if you are under 4 feet and you are older than 16 yrs old then u can ride or if you are not under 4 feet then u can also ride . and if you are not older than16 yr old and under 4 feet tall than u can not ride i.e
so [r ∧ ¬s) ⟶ ¬q now coming to your ans
Let q represent "You can ride the roller coaster".
c represent "You are not older than 16 years old."
a represent "You are under 4 feet tall"
then, (c⟶a) ⟶ ¬q. or ~c v a -> ~q this says if u r older than 16 or u r under 4 feet tall then u can not ride roller coaster which can not be true also c->a says if u r not older than 16 u r under 4 feet tall which is neither given nor derived