Quizzical probability [puzzle, GAs ended]

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I had the idea to make something like this for a while, since chour's puzzle that had some probability iirc, but it did not feel puzzley enough and I haven't gone around to do it until now. Yeah, even though I put [puzzle] tag in the title, that's mostly just so people looking for puzzles can see it better. Otherwise it's pretty much just a straight up math quiz. I suppose the area may be somewhat puzzling, though, in its own regard: probability/combinatorics.

But since I'm making a miniseries combined for some nicer reward, I figured I may as well go with this math quiz. This is second puzzle in the miniseries. These are otherwise not related and the giveaway on the first one has already ended, but it's still considered active for the grander picture that is to come.

There are 4 quizzes here in total, with 3 giveaways. The quizzes should be progressively harder and rewards hopefully progressively better but still don't count on some godly rewards. If you feel like you're wasting time doing puzzles, just don't do them.

Please don't discuss the solutions even after the giveaways are done. Due to my miniseries this puzzle here will be considered active even after the giveaways have ended. I will probably just link to the itstoohard solution for the first quiz to jumpstart miniseries completionists as it's not meant to be hard anyway, but I don't think any additional hints will be provided for them later on.

Meanwhile, these are the ending times of the three giveaways and required CV values:

Giveaway #1 timer (2014 JAN 09 2000 ZULU) - CV $0.01000 (ENDED)
Giveaway #2 timer (2014 JAN 11 2000 ZULU) - CV $30.02000 (ENDED)
Giveaway #3 timer (2014 JAN 12 2200 ZULU) - CV $3.33000 (ENDED)

Okay, to the quizzes then.

Unless otherwise stated, questions regard giveaway site equivalent to SteamGifts, giveaways for just one copy of the game, and Gregorian calendar.
Always assume you are eligible to enter the giveaways in question i.e. ignore stuff like points or contributor value. Also, the questions are about "raw" probability, there and then, so ignore stuff like people leaving or entering the giveaway before the giveaway ends, or even more obscure possibilities like someone asking for a reroll, people getting banned, meteorites hitting the datacenter so no wins for you... Nope, we're not considering such scenarios. If I say there are 20 entries then each individual person there has 1 in 20 chances to win, simple as that. Although sometimes I paint some more specific scenario so do pay attention.

Always write your answers as a decimal number with 5 digits after decimal point, with leading/trailing zeroes or rounding if necessary. For example, for 1 chance in 6, or 1/6, or 16.66666666...% the answer you'll have to put is 0.16667

Obviously do not cheat or you're risking long suspension: don't ask others for help and do not give help to others, that includes answers, giveaways, itstoohard links etc. It's not a group puzzle, solve it on your own or skip it.

http://www.itstoohard.com/quiz/wbCenIUg

Good luck, have fun!

Giveaways done, but puzzle still to be considered active!

So please keep it spoiler free for now, still. Like I said this is part of miniseries and later on I'll want to make something special for folks who solved all.

For now, let me just expedite a bit possible future solvers who missed this, and provide you itstoohard solution for the first quiz. It was meant to be very easy anyway. But if you have problems with the very last question, come back to it and try to solve it anyway as it contains certain foreshadowin.

Anyway, Quiz 1 itstoohard solution: http://www.itstoohard.com/quiz/wbCenIUg/hW4qN3vV

10 years ago*

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94 Comments

faragona

Stuck in P2 Q2. Haven't used probability for about 6 years, and it bring me headache now D:

10 years ago