Yes, that's how I got the Fairy dragon. Magic/Fruitful. Neither were Epic. You may end up with another Fruitful (hopefully NOT). There are other Y/G & G/Y plus Purple combos you may get, too.
I don't believe there is any hard Maths & Sciences behind the Art & Magic of breeding these dragons
Hmmm, wonder if Roy G Biv has any tips on getting a Diamond dragon...