Xenia has a bag which contains 5 red marbles and 4 pink marbles. She draws marbles one at a time without replacement until she draws a pink at which point she stops. Let R be the random variable which...

Xenia has a bag which contains 5 red marbles and 4 pink marbles. She draws marbles one at a time without replacement until she draws a pink at which point she stops. Let R be the random variable which counts the number of red marbles that have been drawn when she stops. Compute Pr[R≥1].