I can't see what's wrong with that answer. What should the answer be?
The silly trick is that, if you flipped it 100 times, then it didn't break the first 99 flips, so it's a conditional probability question in disguise.
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The silly trick is that, if you flipped it 100 times, then it didn't break the first 99 flips, so it's a conditional probability question in disguise.