Question

statistics:
you are playing a special game of texas holdem. only six cards are being used: jack, queen, and king of diamonds and the jack, queen, and king of spades. You are dealt two cards face down and your opponent is dealt two cards face down. One card is flipped over as the common card for both to use.
You see the two private cards in your own hand are the jack of spades and the king of spades. The common card is still unknown. What is the probability that your opponent has a flush (jack, queen, and king of diamonds) ?