Proof by Resolution: (1) Negate the conclusion
Coloured flowers are always scented.
(forall x) ( C(x) -> S(x) )
I dislike flowers that are not grown in the open air.
(forall x) ( ~A(x) -> D(x) )
No flowers grown in the open air are colourless.
(forall x) ( A(x) -> ~~C(x) )
It is not the case that I dislike all flowers that are not scented.
~(forall x) (~S(x) -> D(x) )