Priya has two sets of cards, Set 1 and Set 2. There are three cards in each set.
Set 1: 1, 2, 3
Set 2: 4, 5, 6
Priya picks one card from Set 1 and one card from Set 2. She multiplies the numbers on the two cards to calculate the product.
Work out the probability that the product is an even number.