Interview Query

Coin Flip Probability

12
Have you seen this question before?

Let’s say you are playing a coin flip game. You start with 30 dollars. If you flip heads, you win one dollar, but if you get tails, you lose one dollar. You keep playing until you run out of money (have 0) or until you win 100 dollars. 

What is the probability that you win 100 dollars?

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