So this was asked to me by one of my friend and is based on probability which I thing is Conditional \ Bayes Theorem.

```
You've 6 folders in your office where you store your documents (with equal probabilities).
But in 1/3 cases - you simply leave the documents in your home.
Today you need a document in your office & start searching your office folders.
How many folders you'd have checked after which you can conclude that that
the probability of finding that document in your office is 50%?
```

Can someone provide me a detailed solution to this problem. Thanks

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