Recently I have founded some problems about probabilities, that ask to find the probability of an event at a given trial.
A dollar coin is toss several times until ones get "one dollar" face up. What is the probability to toss the coin at least $3$ times?
I thought to apply for the binomial law.But the binomial law gives the probability for a number of favorable trials, and the question ask for a specific trial.How can I solve this kind of problem?
Is there any methodology that one can apply for this kind of problems?