A bucket contains 4 red marbles, 10 blue marbles, 7 yellow marbles, and 5 green marbles. The probabiity of getting a red followed by a green without replacement is ?
Give answer as a reduced fraction

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?