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little math puzzle. False positives
05-11-2018, 11:07 AM
Post: #1
little math puzzle. False positives
Mining unobtainium is hard work – the rare mineral appears in only 1% of rocks in the mine. But your friend Tricky Joe has something up his sleeve. The unobtainium detector he’s been perfecting for months is finally ready.
The unobtanium detector reports 100% success if the mineral is contained in the rock. Otherwise it says with a reliability of 90% that the rock is a dummy.

Once found a rock that is reported as positive using the detector, you get outside the mine. Tricky Joe says "look, I don't want to go selling this thing and get 50% of the revenue. If you want I get only 200$ and then you can sell it to the market for its price (1000$)".

Do you accept the deal?

Solution: https://www.youtube.com/watch?v=1csFTDXXULY
Also brilliant.org is doing a quite nice aggressive marketing, it is a pity that they collect tons of nice problems (and tons of spam) but as every modern social network focused on "now" it is impossible to find a list of them. Either one has a lot of patience to scroll the list, or the available problems are only the last ones. And once again plenty of interesting contributions are practically lost.

Wikis are great, Contribute :)
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05-11-2018, 12:21 PM
Post: #2
RE: little math puzzle. False positives
(05-11-2018 11:07 AM)pier4r Wrote:  [...] but as every modern social network focused on "now" it is impossible to find a list of them.

If you want a stash of problems that are listed and archived then there's Project Euler.
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05-11-2018, 01:24 PM
Post: #3
RE: little math puzzle. False positives
Thanks!

Nonetheless I always like collection of problems coming from this or that community. Brilliant has a lot of potential, ideally.

Wikis are great, Contribute :)
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