Directions
Imagine a class of 9 girls and 6 boys. The teacher needs 1 girl and 1 boy to play the leading roles in the school play. She makes her selections by drawing names from a hat.
She begins with the girls. There are 9 names in the hat so each girl has a 1 out of 9 chance of being chosen. She does the same with the boys, but because there are 6 of them, each boy has a 1 out of 6 chance.