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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: (1.63) 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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 cms271828 Feb 14, 2006 Nice easy one, you would have to take out all 56 non-reds first, then the 3 reds ben2 Feb 15, 2006 good and easy, my favorite kind keveffect1 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 thompson1 Mar 10, 2006 this was really good . the only problem is i STILLdont get it!! Methlos 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. calmsavior Apr 12, 2006 thats the worstcase scenario jax_the_ax Apr 13, 2006 DUMB npf2005 Apr 13, 2006 what? udoboy May 26, 2006 This question has nothing to do with probability. mmmcla01 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 Sep 26, 2007 very nice and very tricky!! spinnercat Oct 01, 2007 wrong category, but good teaser. jsdodgers Apr 03, 2008 WAAAYY too easy. You must be VERY unlucky to take that many picks though. javaguru 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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