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If you are at 0 on a number line, flip a coin, move +2 on heads and -1 on tails, <br/>
what is the probability that it will hit -1?

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关键词：interesting question interest inter Quest

2 questions:

1. flip a coin once or? if not once, its a process

2. is the coin fair, s.t. Pr(head) = Pr(tail) = 1/2?

1 Flip a coin as many times as you want. Yes, it is a process.
2 it is a fair coin.