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More ways to get Braingle...

Bag of Balls

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#28618
Fun:*** (2.31)
Difficulty:** (1.64)
Category:Probability
Submitted By:npf2005*

 

 

 



A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?




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Comments

cms271828
Feb 14, 2006

Nice easy one, you would have to take out all 56 non-reds first, then the 3 reds
ben2Akr*
Feb 15, 2006

good and easy, my favorite kind
keveffect1*us*
Feb 21, 2006

Way too easy and color is spelled as seen not colour (Unless your British I guess)
npf2005*
Feb 22, 2006

im british. to be exact english
yellasubmrn
Feb 25, 2006

Sorry but it was a little bit too easy. Nice, though.
npf2005*
Feb 26, 2006

i cant submit any hard teasers. im too dumb to make them up lol
Lui312*
Mar 01, 2006

wow pretty good
thompson1Aus*
Mar 10, 2006

this was really good . the only problem is i STILLdont get it!!
MethlosAgb*
Mar 12, 2006

colour is the best way of spellling colour
jntrcs*
Mar 15, 2006

colour color who cares. i enjoyed the puzzle easy enough to get yet fun.
calmsaviorAus*
Apr 12, 2006

thats the worstcase scenario
jax_the_axnf*
Apr 13, 2006

DUMB
npf2005*
Apr 13, 2006

what?
udoboy*us*
May 26, 2006

This question has nothing to do with probability.
mmmcla01A*
Jun 30, 2006

udoboy...I totally agree...how is this probability?
Dedrik
Aug 09, 2006

you are looking for a probability of 100% if you want a harder version how many does he need to get a 42% chance of having 3 reds
masquerademe235*us*
Sep 26, 2007

very nice and very tricky!!
spinnercatAus*
Oct 01, 2007

wrong category, but good teaser.
jsdodgersAus**
Apr 03, 2008

WAAAYY too easy. You must be VERY unlucky to take that many picks though.
javaguru*us*
Dec 22, 2008

And probability figures into this how?

Maybe if you wanted to know that there is a 8C2 / 64C58 = 28/74974368 = 1/2677656 (approx. 0.000000373) probability of having to pick 59 balls before getting three red balls. But as stated, this is neither a probability teaser nor an interesting teaser.



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