There are 13 diamonds in a regular deck of cards.
So the probability of picking a diamond card is 13/52.
The firat box goes into the seond box and the second box goes into the first box
You can break down 104 into 100 and 4 and break down 57 into 50 and 7:
100*50
+
100*7
+
4*50
+
7*4
