thats not how math works
as its been said before there are 56 possible cards
having two decks means that there are 112 possible cards
you have to pick two
the odds of getting the pair right is 1/(112 choose 2)
*choose is a mathematical function
google 112 choose 2
now, if you consider the hint meaning that both cards are the same card
then you are essentially picking one card from 56
so the odds of you of guessing correctly is 1/56