What is the color of the dress Selena is wearing ?

Question

Selena, Jennifer and Miley wear
a blue dress, yellow dress, and green dress
in an unknown order.
It is known that :

1) If Selena wears blue, then Jennifer wears green.
2) If Selena wears yellow, then Miley wears green.
3) If Jennifer does not wear yellow, then Miley wears blue.

What is the color of the dress Selena is wearing ?

Answer 1

Condition 1, if Selena wears blue, then Jennifer wears green. Then, from condition 3, Jennifer is not wearing yellow so Miley is wearing blue. That is impossible as Selena is wearing blue! So blue is excluded.
Condition 2, if Selena wears yellow, then Miley wears green. Then Jennifer is wearing blue. Then, from condition 3, Miley is wearing blue. That is impossible as Miley is wearing green! So yellow is excluded.
Selena is wearing green, and it doesn't violate any of the conditions