Joan tries to solve a really hard problem once each day.  She has a 1/4 probability of solving it each day.  What is the probability that she will solve it before her sixth try?
Question:
Joan tries to solve a really hard problem once each day.  She has a 1/4 probability of solving it each day.  What is the probability that she will solve it before her sixth try?
Answer:
Let's think step by step.

user
\frac{781}{1024}
Joan tries to solve a really hard problem once each day.  She has a 1/4 probability of solving it each day.  What is the probability that she will solve it before her sixth try?
train